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Vivo Y51 (2020, December) 128GB vs Xiaomi Mi 9 (2019) 256GB

Created date: 2020-12-05 15:41:09

vivo Y51 (2020, December) 128GBXiaomi Mi 9 (2019) 256GB
vivo Y51 (2020, December) 128GBXiaomi Mi 9 (2019) 256GB

Are you having trouble comparing the differences in features and performance of the "vivo Y51 (2020, December) 128GB" and "Xiaomi Mi 9 (2019) 256GB", or unsure about their differences in ease-of-use, and wondering which to buy? We did a deep-dive comparison of the features, specs, and capabilities of these two smartphone, and provided our rating of which one was a better buy.

vivo Y51 (2020, December) 128GBXiaomi Mi 9 (2019) 256GB
vivo Y51 (2020, December) 128GB

Xiaomi Mi 9 (2019) 256GB

General rating:
Portabilityrating-image3.1
61/100
rating-image3.2
63/100
Weightrating-image2.8
55/100
rating-image3.1
61/100
Size of screenrating-image4.5
90/100
rating-image4.5
90/100
Screen clarityrating-image4.2
84/100
rating-image4.2
84/100
Battery durationrating-image
- /100
rating-image3.5
69/100
Processing capabilityrating-image4.6
91/100
rating-image4.8
96/100
Memory capacityrating-image4.7
93/100
rating-image4.7
93/100
Storage capacityrating-image4.5
90/100
rating-image4.6
91/100
Rear camera functionrating-image4.9
97/100
rating-image4.9
97/100
Front camera functionrating-image3.8
75/100
rating-image4.1
81/100

Compare Performance and Usability

Size comparison of "vivo Y51 (2020, December) 128GB" and "Xiaomi Mi 9 (2019) 256GB". 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 "vivo Y51 (2020, December) 128GB" is 75.3mm wide, 163.9mm tall, and 8.4mm thick. The "Xiaomi Mi 9 (2019) 256GB" is 74.7mm tall, 157.5mm wide, and 7.6mm thick.

There is no real difference between the "vivo Y51 (2020, December) 128GB" and "Xiaomi Mi 9 (2019) 256GB" when comparing their width, thickness, and slimness; they are both around the same in terms of one-handed ease of use and carry. Because of this, it is better to compare them based on other aspects of performance and function.

There is no real difference in length or width between the "vivo Y51 (2020, December) 128GB" and "Xiaomi Mi 9 (2019) 256GB", so they are both about the same in terms of usability, ease of carry, and bulkiness. Because of this, it is better to compare them based on other aspects of performance and function.

When comparing their sizes as a whole, there is no real difference between the "vivo Y51 (2020, December) 128GB"and "Xiaomi Mi 9 (2019) 256GB". Thus they are roughly the same in terms of ease of carry and one-handed use. Because of this, it is better to compare them based on other aspects of performance and function.

ScoreDimensions (width x height x thickness)
vivo Y51 (2020, December) 128GB61/10075.3mm x 163.9mm x 8.4mm
Xiaomi Mi 9 (2019) 256GB63/10074.7mm x 157.5mm x 7.6mm

Which one is easier to hold, "vivo Y51 (2020, December) 128GB" or "Xiaomi Mi 9 (2019) 256GB"? 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 "vivo Y51 (2020, December) 128GB" weighs 188.0g. The "Xiaomi Mi 9 (2019) 256GB" clocks in at 173.0g. Comparing the weight of the main unit, the "Xiaomi Mi 9 (2019) 256GB" is a lighter phone than the "vivo Y51 (2020, December) 128GB", with a difference of approximately 15g. Therefore, there is less strain on your fingers and wrists even when you use your phone for a long time on the "Xiaomi Mi 9 (2019) 256GB" compared to the "vivo Y51 (2020, December) 128GB". For this reason, the "Xiaomi Mi 9 (2019) 256GB" is recommended.

ScoreWeight
vivo Y51 (2020, December) 128GB55/100188.0g
Xiaomi Mi 9 (2019) 256GB61/100173.0g

Which is better in terms of display, "vivo Y51 (2020, December) 128GB" or "Xiaomi Mi 9 (2019) 256GB"?

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 "vivo Y51 (2020, December) 128GB" is 6.58inch, and 6.39inch on the "Xiaomi Mi 9 (2019) 256GB". The screens of the "vivo Y51 (2020, December) 128GB" and "Xiaomi Mi 9 (2019) 256GB" 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
vivo Y51 (2020, December) 128GB90/1006.58inch
Xiaomi Mi 9 (2019) 256GB90/1006.39inch

Which one has a better display, "vivo Y51 (2020, December) 128GB" or "Xiaomi Mi 9 (2019) 256GB"?

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 "vivo Y51 (2020, December) 128GB" has a 1080 x 2408 resolution and a pixel density of 401ppi. The "Xiaomi Mi 9 (2019) 256GB", on the other hand, has a screen resolution of 1080 x 2340 and a pixel density of 403ppi. There is not much of a difference in the pixel resolutions of the "vivo Y51 (2020, December) 128GB" and "Xiaomi Mi 9 (2019) 256GB", 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
vivo Y51 (2020, December) 128GB84/100401ppi
Xiaomi Mi 9 (2019) 256GB84/100403ppi

How is the battery duration of "vivo Y51 (2020, December) 128GB" different from that of "Xiaomi Mi 9 (2019) 256GB" ? 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.

ScoreBattery capacity
vivo Y51 (2020, December) 128GB - /100
Xiaomi Mi 9 (2019) 256GB69/1003300.0mAh

Which is better in terms of CPU function, "vivo Y51 (2020, December) 128GB" or "Xiaomi Mi 9 (2019) 256GB"?

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 "vivo Y51 (2020, December) 128GB" is equipped with a Qualcomm SDM665 Snapdragon 665 processor, and its performance speed is 2.0GHz+1.8GHz×8(8.0-cores). The "Xiaomi Mi 9 (2019) 256GB" uses an Qualcomm SM8150 Snapdragon 855 CPU that performs at a speed of 2.84GHz+2.42GHz+1.78GHz×8(8.0-cores). There is also no real discrepancy between the CPU performances of the "vivo Y51 (2020, December) 128GB" and "Xiaomi Mi 9 (2019) 256GB". 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
vivo Y51 (2020, December) 128GB91/1002.0GHz+1.8GHz×8(8.0-cores)
Xiaomi Mi 9 (2019) 256GB96/1002.84GHz+2.42GHz+1.78GHz×8(8.0-cores)

How is "vivo Y51 (2020, December) 128GB" different from "Xiaomi Mi 9 (2019) 256GB" 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 "vivo Y51 (2020, December) 128GB" has 8.0GB of memory. The "Xiaomi Mi 9 (2019) 256GB", on the other hand, has 8.0GB. Memory performance is roughly the same for both the "vivo Y51 (2020, December) 128GB" and "Xiaomi Mi 9 (2019) 256GB"; as a result, multitasking, playing 3D games, and using VR feels the same on both devices. Because of this, it is better to compare them based on other aspects of performance and function.

ScoreRAM size
vivo Y51 (2020, December) 128GB93/1008.0GB
Xiaomi Mi 9 (2019) 256GB93/1008.0GB

Which has a better storage capacity, "vivo Y51 (2020, December) 128GB" or "Xiaomi Mi 9 (2019) 256GB"?

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 "vivo Y51 (2020, December) 128GB" has 128.0GB of storage, while the "Xiaomi Mi 9 (2019) 256GB" has 256.0GB. There is no real difference between the "vivo Y51 (2020, December) 128GB"and "Xiaomi Mi 9 (2019) 256GB" 's ROMs and storage capacities, so both can store roughly the same amount of photographs and apps. Because of this, it is better to compare them based on other aspects of performance and function.

ScoreStorage size
vivo Y51 (2020, December) 128GB90/100128.0GB
Xiaomi Mi 9 (2019) 256GB91/100256.0GB

Compare the rear cameras of "vivo Y51 (2020, December) 128GB" and "Xiaomi Mi 9 (2019) 256GB". 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 "vivo Y51 (2020, December) 128GB" has 48.0MP. The "Xiaomi Mi 9 (2019) 256GB" has 48.0MP. The rear facing cameras of the "vivo Y51 (2020, December) 128GB" and "Xiaomi Mi 9 (2019) 256GB" 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
vivo Y51 (2020, December) 128GB97/10048.0MP
Xiaomi Mi 9 (2019) 256GB97/10048.0MP

Which has a front camera with better picture quality, "vivo Y51 (2020, December) 128GB" or "Xiaomi Mi 9 (2019) 256GB"?

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 "vivo Y51 (2020, December) 128GB" has a resolution of 16.0MP. The "Xiaomi Mi 9 (2019) 256GB"'s has 20.0MP. Comparing the front-facing camera performance, the number of pixels of the front-facing camera on the "Xiaomi Mi 9 (2019) 256GB" is higher than the "vivo Y51 (2020, December) 128GB", with a difference of approximately 4MP. For this reason, it is possible to take higher quality selfies and make clear prints with the "Xiaomi Mi 9 (2019) 256GB" than the "vivo Y51 (2020, December) 128GB". Therefore, the "Xiaomi Mi 9 (2019) 256GB" is recommended.

ScoreFront-camera resolution
vivo Y51 (2020, December) 128GB75/10016.0MP
Xiaomi Mi 9 (2019) 256GB81/10020.0MP

Compare Performance Specs

vivo Y51 (2020, December) 128GBXiaomi Mi 9 (2019) 256GB
Imagevivo Y51 (2020, December) 128GBXiaomi Mi 9 (2019) 256GB
MakervivoXiaomi
Release date2020-12-072019-03
ColorTitanium Sapphire/Crystal SymphonyLavender Violet/Ocean Blue/Piano Black
OSAndroidAndroid
Dimensions (width x height x thickness)75.3mm x 163.9mm x 8.4mm74.7mm x 157.5mm x 7.6mm
Weight188.0g173.0g
Display size6.58inch6.39inch
Display typeIPS LCDSuper AMOLED
Screen resolution (width x height)1080 x 24081080 x 2340
Pixel density401ppi403ppi
ChipsetQualcomm SDM665 Snapdragon 665Qualcomm SM8150 Snapdragon 855
CPU specs2.0GHz+1.8GHz×8(8.0-cores)2.84GHz+2.42GHz+1.78GHz×8(8.0-cores)
RAM size8.0GB8.0GB
Storage size128.0GB256.0GB
Rear-camera resolution48.0MP48.0MP
Front-camera resolution16.0MP20.0MP

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