Which is better, ROG Phone II ZS660KL or Xiaomi Mi 9? We compared their features and specs in detail

Created date: 09/06/2019, 20:35:35, Updated date: 04/16/2020, 09:44:14

ROG Phone II ZS660KLXiaomi Mi 9
ROG Phone II ZS660KLXiaomi Mi 9

A thorough comparison to see which was better, the ROG Phone II ZS660KL or Xiaomi Mi 9. In what areas do they rate differently, and how do their capabilities compare? We did a deep-dive investigation into each feature.

ROG Phone II ZS660KLXiaomi Mi 9
ROG Phone II ZS660KL

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Xiaomi Mi 9

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General rating:

82.6/100

(The 13th of all smartphones)

81/100

(The 30th of all smartphones)

Portability
55/100
63/100
Weight
44/100
61/100
Size of screen
90/100
90/100
Screen clarity
82/100
84/100
Battery duration
86/100
69/100
Processing capability
98/100
96/100
Memory capacity
99/100
93/100
Storage capacity
99/100
91/100
Rear camera function
97/100
97/100
Front camera function
86/100
81/100

Compare Performance and Usability

Size comparison of ROG Phone II ZS660KL and Xiaomi Mi 9. Which one would you choose?

Your device's size has a huge influence on how easy it is to hold or to operate with one hand. The smaller your device's width, the easier it will be to hold, but you'll also need to take device thickness into account. And when the length and width are both smaller, you'll find that it's much easier for you to operate it one-handed, since your fingers will find it much easier to reach where you want them to. On the other hand, longer lengths and wider widths might lead to devices that are hard to carry in your pocket, bulky even when you keep them in your bag, and all around less portable.

The ROG Phone II ZS660KL is 3.1 inches (77.6 mm) wide, 6.7 inches (171 mm) tall, and 0.4 inches (9.5 mm) thick. The Xiaomi Mi 9 is 2.9 inches (74.7 mm) tall, 6.2 inches (157.5 mm) wide, and 0.3 inches (7.6 mm) thick.

Comparing the width and thickness of the main unit, the Xiaomi Mi 9 is smaller and more compact compared to the ROG Phone II ZS660KL. Therefore, it is easier to grip and hold the Xiaomi Mi 9 than the ROG Phone II ZS660KL. For this reason, the Xiaomi Mi 9 is recommended.

Comparing the width and height of the main unit, the Xiaomi Mi 9 is smaller and more compact than the ROG Phone II ZS660KL. As a result, the Xiaomi Mi 9 is easier to operate with one hand and it is more portable without getting in your way than the ROG Phone II ZS660KL. Therefore, the Xiaomi Mi 9 is recommended.

Comparing the overall size of the main unit, the Xiaomi Mi 9 is smaller than the ROG Phone II ZS660KL. As a result, it is easier to use the Xiaomi Mi 9 with one hand compared to the ROG Phone II ZS660KL, and its size makes it more comfortable to carry around. For this reason, the Xiaomi Mi 9 is recommended.

ScoreDimensions (width x height x thickness)
ROG Phone II ZS660KL55/1003.1 inches (77.6 mm) x 6.7 inches (171 mm) x 0.4 inches (9.5 mm)
Xiaomi Mi 963/1002.9 inches (74.7 mm) x 6.2 inches (157.5 mm) x 0.3 inches (7.6 mm)

Which one is easier to hold, ROG Phone II ZS660KL or Xiaomi Mi 9? Compare weight

The device weight will effect how quickly you tire from holding it, and how much stress is put on your wrist. The lighter it is, the longer you can hold it without feeling tired. Also, less stress on your wrist will make using it easier and more pleasant. Unless the weight is right for you, it might put too much strain on your body and make using it more stressful.

The ROG Phone II ZS660KL weighs 240 oz (240 g). The Xiaomi Mi 9 clocks in at 173 oz (173 g). If you compare the weight of the two, the Xiaomi Mi 9 is a considerably lighter smartphone than the ROG Phone II ZS660KL, with a difference of about 173 oz (67 g). Because of this, the Xiaomi Mi 9 puts less of a burden on the fingers and wrists than the ROG Phone II ZS660KL. If you want a smartphone that won't tire your hands out even when using it for a long time, we recommend that you buy the Xiaomi Mi 9 rather than the ROG Phone II ZS660KL.

ScoreWeight
ROG Phone II ZS660KL44/100240 oz (240 g)
Xiaomi Mi 961/100173 oz (173 g)

Which is better in terms of display, ROG Phone II ZS660KL or Xiaomi Mi 9?

Screen size influences how well you can control your device, as well as how clear the display is. With a large screen, the text and buttons in apps will display large enough so you'll be less likely to accidentally tap the button next to the one you were aiming for. Plus, you'll be able to enjoy more high-impact visuals for games and movies.

The screen size on the ROG Phone II ZS660KL is 6.59 inch, and 6.39 inch on the Xiaomi Mi 9. The screens of the ROG Phone II ZS660KL and Xiaomi Mi 9 are roughly the same size, and so the ease of pressing app buttons are the same on both devices. Because of this, it is better to compare them based on other aspects of performance and function.

ScoreDisplay size
ROG Phone II ZS660KL90/1006.59 inch
Xiaomi Mi 990/1006.39 inch

Which one has a better display, ROG Phone II ZS660KL or Xiaomi Mi 9?

Pixel density influences how nice your device's screen looks, with high pixel densities making screens look more beautiful, and letting you get more out of your games and movies. Plus, the nicer you screen looks, the less strain you'll be putting on your eyes, so you'll tend to be able to use your device for longer before your eyes get tired.

The screen on the ROG Phone II ZS660KL has a 1080 x 2340 resolution and a pixel density of 391 ppi. The Xiaomi Mi 9, on the other hand, has a screen resolution of 1080 x 2340 and a pixel density of 403 ppi. There is not much of a difference in the pixel resolutions of the ROG Phone II ZS660KL and Xiaomi Mi 9, so they are about the same in terms of clarity of image and gentleness on the eyes. For this reason it is better to compare them based on other aspects of performance and function.

ScorePixel density
ROG Phone II ZS660KL82/100391 ppi
Xiaomi Mi 984/100403 ppi

How is the battery duration of ROG Phone II ZS660KL different from that of Xiaomi Mi 9 ? See the differences

Battery performance has a big effect on the battery life of your device. However, a high battery capacity doesn't necessarily mean a long battery life. Rather, the rate of power consumption needs to be taken into consideration as well. The larger the screen and the higher the CPU performance, the higher the rate of power consumption on your battery.

The ROG Phone II ZS660KL has a battery capacity of 6000 mAh, while the Xiaomi Mi 9 has a 3300 mAh battery. With regards to battery performance, the ROG Phone II ZS660KL has a substantially larger battery capacity than the Xiaomi Mi 9, with a difference of 2700 mAh. The ROG Phone II ZS660KL can be used without charging for a longer time than the Xiaomi Mi 9, so it can be used when out and about. If you want a smartphone with a longer-lasting battery, we recommend that you buy the ROG Phone II ZS660KL rather than the Xiaomi Mi 9.

ScoreBattery capacity
ROG Phone II ZS660KL86/1006000 mAh
Xiaomi Mi 969/1003300 mAh

Which is better in terms of CPU function, ROG Phone II ZS660KL or Xiaomi Mi 9?

Your CPU's speed will influence the processing power of the applications you run, and together with the number of cores in the CPU, as well as its clock frequency, will determine the processing power available for apps. The higher these performance factors, the smoother your games and apps will run. Conversely, if these factors are too low, your apps and games will be sluggish and struggle to run.

The ROG Phone II ZS660KL is equipped with a Qualcomm SM8150 Snapdragon 855+ processor, and its performance speed is 2.96GHz+2.42GHz+1.78GHz×8(OctaCore). The Xiaomi Mi 9 uses an Qualcomm SM8150 Snapdragon 855 CPU that performs at a speed of 2.84GHz+2.42GHz+1.78GHz×8(OctaCore). There is also no real discrepancy between the CPU performances of the ROG Phone II ZS660KL and Xiaomi Mi 9. Because of this, both phones will feel practically identical in terms of smoothness when running apps and ease of game play. This is why it is better to compare them based on other aspects of performance and function.

ScoreCPU specs
ROG Phone II ZS660KL98/1002.96GHz+2.42GHz+1.78GHz×8(OctaCore)
Xiaomi Mi 996/1002.84GHz+2.42GHz+1.78GHz×8(OctaCore)

How is ROG Phone II ZS660KL different from Xiaomi Mi 9 in terms of memory capacity?

Your device's multimedia performance and app stability are both influenced by the amount of memory it has available. The more memory, the more apps you can use simultaneously, while keeping everything stable and smooth. Plus, there'll be less chance of animations lagging or apps crashing. You also need to keep in mind that some games won't run at all if there's not enough memory available.

The ROG Phone II ZS660KL has 12GB of memory. The Xiaomi Mi 9, on the other hand, has 8GB. Comparing the memory performance, the ROG Phone II ZS660KL has a larger memory capacity than the Xiaomi Mi 9, with a difference of approximately 4GB. For this reason, multitasking is smoother on the ROG Phone II ZS660KL than the Xiaomi Mi 9, and applications are less likely to crash. Also, it is more enjoyable to play 3D games and VR on the ROG Phone II ZS660KL. For this reason, the ROG Phone II ZS660KL is recommended.

ScoreRAM size
ROG Phone II ZS660KL99/10012GB
Xiaomi Mi 993/1008GB

Which has a better storage capacity, ROG Phone II ZS660KL or Xiaomi Mi 9?

Storage capacity determines the amount of data you'll be able to save on your device. The more storage you have, the more photos you can take and the more apps you can install. Plus, if your smartphone is compatible with SD cards, then you can increase the amount of available storage. However, SD cards have a slower writespeed, making them less desirable in terms of performance, and users should be aware that it won't be possible to transfer all kinds of data to the card.

The ROG Phone II ZS660KL has 1024GB of storage, while the Xiaomi Mi 9 has 256GB. Comparing the ROM and storage capacity, the ROG Phone II ZS660KL has a larger storage capacity compared to the Xiaomi Mi 9, with a difference of approximately 768GB. Consequently, the ROG Phone II ZS660KL can take more photos and videos than the Xiaomi Mi 9 and it is possible to install more applications on it. For this reason, the ROG Phone II ZS660KL is recommended.

ScoreStorage size
ROG Phone II ZS660KL99/1001024GB
Xiaomi Mi 991/100256GB

Compare the rear cameras of ROG Phone II ZS660KL and Xiaomi Mi 9. Which one has better picture quality?

One factor in how well your rear camera (the camera on the back of your device) performs is its megapixel count. With a higher megapixel count, you'll be able to take photos with sharper detail, photos that stay clear and sharp even when printed.

The main camera on the ROG Phone II ZS660KL has 48 MP. The Xiaomi Mi 9 has 48 MP. The rear facing cameras of the ROG Phone II ZS660KL and Xiaomi Mi 9 have roughly the same performance, so the quality of the photograph and video footage they can capture is around the same. Because of this, it is better to compare them based on other aspects of performance and function.

ScoreRear-camera resolution
ROG Phone II ZS660KL97/10048 MP
Xiaomi Mi 997/10048 MP

Which has a front camera with better picture quality, ROG Phone II ZS660KL or Xiaomi Mi 9?

One indication of how well your forward facing camera (the camera on the same side as your device's screen) performs is how many megapixels it has. More megapixels means you'll be able to take photos with sharper detail, that still look amazing printed out.

The forward-facing camera on the ROG Phone II ZS660KL has a resolution of 24 MP. The Xiaomi Mi 9's has 20 MP. There is little difference between the camera capabilities and the pixel density of the ROG Phone II ZS660KL and Xiaomi Mi 9's front facing cameras, so the quality of photographs and video footage is virtually the same. Because of this, it is better to compare them based on other aspects of performance and function.

ScoreFront-camera resolution
ROG Phone II ZS660KL86/10024 MP
Xiaomi Mi 981/10020 MP

Detailed comparison of ROG Phone II ZS660KL and Xiaomi Mi 9

Comparison for general rating

ImageProduct nameReviewgeneral rating

ROG Phone II ZS660KL

Score

82.6Color:Matte Black/Glossy Black, Dimensions (width x height x thickness):3.1 inches (77.6 mm) x 6.7 inches (171 mm) x 0.4 inches (9.5 mm), Weight:240 oz (240 g), Display type:AMOLED, Screen resolution (width x height):1080 x 2340, Pixel density:391 ppi, Display size:6.59 inch, OS:Android

Xiaomi Mi 9

Score

81.0Color:Lavender Violet/Ocean Blue/Piano Black, Dimensions (width x height x thickness):2.9 inches (74.7 mm) x 6.2 inches (157.5 mm) x 0.3 inches (7.6 mm), Weight:173 oz (173 g), Display type:Super AMOLED, Screen resolution (width x height):1080 x 2340, Pixel density:403 ppi, Display size:6.39 inch, OS:Android

Comparison for body size

ImageProduct nameReviewbody size

ROG Phone II ZS660KL

Score

45.6

Xiaomi Mi 9

Score

53.0

Comparison for body weight

ImageProduct nameReviewbody weight

ROG Phone II ZS660KL

Score

44.2

Xiaomi Mi 9

Score

61.2

Comparison for screen size

ImageProduct nameReviewscreen size

ROG Phone II ZS660KL

Score

91.0

Xiaomi Mi 9

Score

90.7

Comparison for screen resolution

ImageProduct nameReviewscreen resolution

ROG Phone II ZS660KL

Score

75.3

Xiaomi Mi 9

Score

75.3

Comparison for GPU performance

ImageProduct nameReviewGPU performance

ROG Phone II ZS660KL

Score

92.5

Xiaomi Mi 9

Score

92.5

Comparison for RAM capacity

ImageProduct nameReviewRAM capacity

ROG Phone II ZS660KL

Score

99.0

Xiaomi Mi 9

Score

93.4

Comparison for storage size

ImageProduct nameReviewstorage size

ROG Phone II ZS660KL

Score

99.0

Xiaomi Mi 9

Score

91.5

Comparison for process integration

ImageProduct nameReviewprocess integration

ROG Phone II ZS660KL

Score

98.0

Xiaomi Mi 9

Score

98.0

Comparison for battery

ImageProduct nameReviewbattery

ROG Phone II ZS660KL

Score

86.0

Xiaomi Mi 9

Score

69.5

Comparison for downlink data communication speed

ImageProduct nameReviewdownlink data communication speed

ROG Phone II ZS660KL

Score

87.1

Xiaomi Mi 9

Score

87.1

Comparison for rear-camera resolution

ImageProduct nameReviewrear-camera resolution

ROG Phone II ZS660KL

Score

97.8

Xiaomi Mi 9

Score

97.8

Comparison for number of wide-angle camera pixels on the back

ImageProduct nameReviewnumber of wide-angle camera pixels on the back

ROG Phone II ZS660KL

Score

89.0

Xiaomi Mi 9

Score

89.0

Comparison for front-camera resolution

ImageProduct nameReviewfront-camera resolution

ROG Phone II ZS660KL

Score

86.6

Xiaomi Mi 9

Score

81.0

Comparison for grip

ImageProduct nameReviewgrip

ROG Phone II ZS660KL

Score

44.9Color:Matte Black/Glossy Black, Dimensions (width x height x thickness):3.1 inches (77.6 mm) x 6.7 inches (171 mm) x 0.4 inches (9.5 mm), Weight:240 oz (240 g)

Xiaomi Mi 9

Score

57.1Color:Lavender Violet/Ocean Blue/Piano Black, Dimensions (width x height x thickness):2.9 inches (74.7 mm) x 6.2 inches (157.5 mm) x 0.3 inches (7.6 mm), Weight:173 oz (173 g)

Comparison for screen cleanliness

ImageProduct nameReviewscreen cleanliness

ROG Phone II ZS660KL

Score

82.9Display type:AMOLED, Screen resolution (width x height):1080 x 2340, Pixel density:391 ppi

Xiaomi Mi 9

Score

84.9Display type:Super AMOLED, Screen resolution (width x height):1080 x 2340, Pixel density:403 ppi

Comparison for screen quality

ImageProduct nameReviewscreen quality

ROG Phone II ZS660KL

Score

87.2Display size:6.59 inch, Display type:AMOLED, Screen resolution (width x height):1080 x 2340, Pixel density:391 ppi

Xiaomi Mi 9

Score

86.0Display size:6.39 inch, Display type:Super AMOLED, Screen resolution (width x height):1080 x 2340, Pixel density:403 ppi

Comparison for performance

ImageProduct nameReviewperformance

ROG Phone II ZS660KL

Score

98.9OS:Android

Xiaomi Mi 9

Score

96.3OS:Android

Compare Performance Specs

ROG Phone II ZS660KLXiaomi Mi 9
ImageROG Phone II ZS660KLXiaomi Mi 9
MakerAsusXiaomi
Release date9, 20193, 2019
ColorMatte Black/Glossy BlackLavender Violet/Ocean Blue/Piano Black
OSAndroidAndroid
Dimensions (width x height x thickness)3.1 inches (77.6 mm) x 6.7 inches (171 mm) x 0.4 inches (9.5 mm)2.9 inches (74.7 mm) x 6.2 inches (157.5 mm) x 0.3 inches (7.6 mm)
Weight240 oz (240 g)173 oz (173 g)
Display size6.59 inch6.39 inch
Display typeAMOLEDSuper AMOLED
Screen resolution (width x height)1080 x 23401080 x 2340
Pixel density391 ppi403 ppi
Battery capacity6000 mAh3300 mAh
ChipsetQualcomm SM8150 Snapdragon 855+Qualcomm SM8150 Snapdragon 855
CPU specs2.96GHz+2.42GHz+1.78GHz×8(OctaCore)2.84GHz+2.42GHz+1.78GHz×8(OctaCore)
RAM size12GB8GB
Storage size1024GB256GB
Rear-camera resolution48 MP48 MP
Front-camera resolution24 MP20 MP

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