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Which should you buy, the Zenfone 4 Pro ZS551KL 128GB or Zenfone 5z ZS620KL 256GB? We offer a thorough comparison of the differences in functions, specifications and performance between the two

Created date: 2018-09-30 23:22:35, Updated date: 2020-04-16 19:31:29

Zenfone 4 Pro ZS551KL 128GBZenfone 5z ZS620KL 256GB
Zenfone 4 Pro ZS551KL 128GBZenfone 5z ZS620KL 256GB

Here's our thorough comparison of the difference in performance and function between the "Zenfone 4 Pro ZS551KL 128GB" and "Zenfone 5z ZS620KL 256GB". Which one should you buy? We'll compare and explain what differs between the "Zenfone 4 Pro ZS551KL 128GB" and "Zenfone 5z ZS620KL 256GB" in a way that even people who aren't used to choosing between two similar products can understand.

Zenfone 4 Pro ZS551KL 128GBZenfone 5z ZS620KL 256GB
Zenfone 4 Pro ZS551KL 128GB

Zenfone 5z ZS620KL 256GB

General rating:
Portabilityrating-image3.1
62/100
rating-image3.1
61/100
Weightrating-image3.0
60/100
rating-image3.2
64/100
Size of screenrating-image4.1
82/100
rating-image4.5
90/100
Screen clarityrating-image4.3
85/100
rating-image4.2
84/100
Battery durationrating-image3.7
74/100
rating-image3.5
69/100
Processing capabilityrating-image4.6
91/100
rating-image4.7
94/100
Memory capacityrating-image4.5
90/100
rating-image4.7
93/100
Storage capacityrating-image4.5
90/100
rating-image4.6
91/100
Rear camera functionrating-image3.4
68/100
rating-image3.0
59/100
Front camera functionrating-image2.9
58/100
rating-image2.9
58/100

Compare Performance and Usability

Size comparison of "Zenfone 4 Pro ZS551KL 128GB" and "Zenfone 5z ZS620KL 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 "Zenfone 4 Pro ZS551KL 128GB" is 75.6mm wide, 156.9mm tall, and 7.6mm thick. The "Zenfone 5z ZS620KL 256GB" is 75.7mm tall, 153.0mm wide, and 7.9mm thick.

There is no real difference between the "Zenfone 4 Pro ZS551KL 128GB" and "Zenfone 5z ZS620KL 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 "Zenfone 4 Pro ZS551KL 128GB" and "Zenfone 5z ZS620KL 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 "Zenfone 4 Pro ZS551KL 128GB"and "Zenfone 5z ZS620KL 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)
Zenfone 4 Pro ZS551KL 128GB62/10075.6mm x 156.9mm x 7.6mm
Zenfone 5z ZS620KL 256GB61/10075.7mm x 153.0mm x 7.9mm

Which one is easier to hold, "Zenfone 4 Pro ZS551KL 128GB" or "Zenfone 5z ZS620KL 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 "Zenfone 4 Pro ZS551KL 128GB" weighs 175.0g. The "Zenfone 5z ZS620KL 256GB" clocks in at 165.0g. The "Zenfone 4 Pro ZS551KL 128GB" and "Zenfone 5z ZS620KL 256GB" have around the same weight, so prolonged use will tire out fingers nd wrists to around the same degree. Because of this, it is better to compare them based on other aspects of performance and function.

ScoreWeight
Zenfone 4 Pro ZS551KL 128GB60/100175.0g
Zenfone 5z ZS620KL 256GB64/100165.0g

Which is better in terms of display, "Zenfone 4 Pro ZS551KL 128GB" or "Zenfone 5z ZS620KL 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 "Zenfone 4 Pro ZS551KL 128GB" is 5.5inch, and 6.2inch on the "Zenfone 5z ZS620KL 256GB". Comparing the size of the display and screen, the screen size of the "Zenfone 5z ZS620KL 256GB" is larger than that of the "Zenfone 4 Pro ZS551KL 128GB", with a difference of approximately 0.7inch. As a result, there will be unintended touches on the "Zenfone 5z ZS620KL 256GB" compared to the "Zenfone 4 Pro ZS551KL 128GB" and it is possible to enjoy games and videos on a large screen. For this reason, the "Zenfone 5z ZS620KL 256GB" is recommended.

ScoreDisplay size
Zenfone 4 Pro ZS551KL 128GB82/1005.5inch
Zenfone 5z ZS620KL 256GB90/1006.2inch

Which one has a better display, "Zenfone 4 Pro ZS551KL 128GB" or "Zenfone 5z ZS620KL 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 "Zenfone 4 Pro ZS551KL 128GB" has a 1080 x 1920 resolution and a pixel density of 400ppi. The "Zenfone 5z ZS620KL 256GB", on the other hand, has a screen resolution of 1080 x 2246 and a pixel density of 401ppi. There is not much of a difference in the pixel resolutions of the "Zenfone 4 Pro ZS551KL 128GB" and "Zenfone 5z ZS620KL 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
Zenfone 4 Pro ZS551KL 128GB85/100400ppi
Zenfone 5z ZS620KL 256GB84/100401ppi

How is the battery duration of "Zenfone 4 Pro ZS551KL 128GB" different from that of "Zenfone 5z ZS620KL 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.

The "Zenfone 4 Pro ZS551KL 128GB" has a battery capacity of 3600.0mAh, while the "Zenfone 5z ZS620KL 256GB" has a 3300.0mAh battery. The batteries of both the "Zenfone 4 Pro ZS551KL 128GB" and "Zenfone 5z ZS620KL 256GB" perform to the same extent. There is also no difference in the battery capacities of the "Zenfone 4 Pro ZS551KL 128GB" and the "Zenfone 5z ZS620KL 256GB". Since their battery life is practically identical, it would be better to compare them based on other aspects of performance and function.

ScoreBattery capacity
Zenfone 4 Pro ZS551KL 128GB74/1003600.0mAh
Zenfone 5z ZS620KL 256GB69/1003300.0mAh

Which is better in terms of CPU function, "Zenfone 4 Pro ZS551KL 128GB" or "Zenfone 5z ZS620KL 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 "Zenfone 4 Pro ZS551KL 128GB" is equipped with a Qualcomm MSM8998 Snapdragon 835 processor, and its performance speed is 2.45GHz+1.9GHz×8(8.0-cores). The "Zenfone 5z ZS620KL 256GB" uses an Qualcomm SDM845 Snapdragon 845 CPU that performs at a speed of 2.7GHz+1.7GHz×8(8.0-cores). There is also no real discrepancy between the CPU performances of the "Zenfone 4 Pro ZS551KL 128GB" and "Zenfone 5z ZS620KL 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
Zenfone 4 Pro ZS551KL 128GB91/1002.45GHz+1.9GHz×8(8.0-cores)
Zenfone 5z ZS620KL 256GB94/1002.7GHz+1.7GHz×8(8.0-cores)

How is "Zenfone 4 Pro ZS551KL 128GB" different from "Zenfone 5z ZS620KL 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 "Zenfone 4 Pro ZS551KL 128GB" has 6.0GB of memory. The "Zenfone 5z ZS620KL 256GB", on the other hand, has 8.0GB. Memory performance is roughly the same for both the "Zenfone 4 Pro ZS551KL 128GB" and "Zenfone 5z ZS620KL 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
Zenfone 4 Pro ZS551KL 128GB90/1006.0GB
Zenfone 5z ZS620KL 256GB93/1008.0GB

Which has a better storage capacity, "Zenfone 4 Pro ZS551KL 128GB" or "Zenfone 5z ZS620KL 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 "Zenfone 4 Pro ZS551KL 128GB" has 128.0GB of storage, while the "Zenfone 5z ZS620KL 256GB" has 256.0GB. There is no real difference between the "Zenfone 4 Pro ZS551KL 128GB"and "Zenfone 5z ZS620KL 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
Zenfone 4 Pro ZS551KL 128GB90/100128.0GB
Zenfone 5z ZS620KL 256GB91/100256.0GB

Compare the rear cameras of "Zenfone 4 Pro ZS551KL 128GB" and "Zenfone 5z ZS620KL 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 "Zenfone 4 Pro ZS551KL 128GB" has 16.0MP. The "Zenfone 5z ZS620KL 256GB" has 12.0MP. Comparing the rear camera performance, the number of pixels of the "Zenfone 4 Pro ZS551KL 128GB" is higher than the "Zenfone 5z ZS620KL 256GB", with a difference of approximately 4MP. As a result, the "Zenfone 4 Pro ZS551KL 128GB" can take higher quality scenery photos and make clear prints compared to the "Zenfone 5z ZS620KL 256GB". Therefore, the "Zenfone 4 Pro ZS551KL 128GB" is recommended.

ScoreRear-camera resolution
Zenfone 4 Pro ZS551KL 128GB68/10016.0MP
Zenfone 5z ZS620KL 256GB59/10012.0MP

Which has a front camera with better picture quality, "Zenfone 4 Pro ZS551KL 128GB" or "Zenfone 5z ZS620KL 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 "Zenfone 4 Pro ZS551KL 128GB" has a resolution of 8.0MP. The "Zenfone 5z ZS620KL 256GB"'s has 8.0MP. There is little difference between the camera capabilities and the pixel density of the "Zenfone 4 Pro ZS551KL 128GB" and "Zenfone 5z ZS620KL 256GB"'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
Zenfone 4 Pro ZS551KL 128GB58/1008.0MP
Zenfone 5z ZS620KL 256GB58/1008.0MP

Compare Performance Specs

Zenfone 4 Pro ZS551KL 128GBZenfone 5z ZS620KL 256GB
ImageZenfone 4 Pro ZS551KL 128GBZenfone 5z ZS620KL 256GB
MakerAsusAsus
Release date2017-102018-06
ColorMoonlight white/Pure BlackMidnight Blue/Meteor Silver
OSAndroidAndroid
Dimensions (width x height x thickness)75.6mm x 156.9mm x 7.6mm75.7mm x 153.0mm x 7.9mm
Weight175.0g165.0g
Display size5.5inch6.2inch
Display typeAMOLEDIPS LCD
Screen resolution (width x height)1080 x 19201080 x 2246
Pixel density400ppi401ppi
Battery capacity3600.0mAh3300.0mAh
ChipsetQualcomm MSM8998 Snapdragon 835Qualcomm SDM845 Snapdragon 845
CPU specs2.45GHz+1.9GHz×8(8.0-cores)2.7GHz+1.7GHz×8(8.0-cores)
RAM size6.0GB8.0GB
Storage size128.0GB256.0GB
Rear-camera resolution16.0MP12.0MP
Front-camera resolution8.0MP8.0MP

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