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Vivo S1 Pro (China) 256GB vs vivo X21 UD (2018) 128GB

Created date: 2019-11-18 17:52:47, Updated date: 2021-10-20 20:18:54

vivo S1 Pro (China) 256GBvivo X21 UD (2018) 128GB
vivo S1 Pro (China) 256GBvivo X21 UD (2018) 128GB

Here's our thorough comparison of the difference in performance and function between the "vivo S1 Pro (China) 256GB" and "vivo X21 UD (2018) 128GB". Which one should you buy? We'll compare and explain what differs between the "vivo S1 Pro (China) 256GB" and "vivo X21 UD (2018) 128GB" in a way that even people who aren't used to choosing between two similar products can understand.

vivo S1 Pro (China) 256GBvivo X21 UD (2018) 128GB
vivo S1 Pro (China) 256GB

vivo X21 UD (2018) 128GB

General rating:
Portabilityrating-image3.1
62/100
rating-image3.2
64/100
Weightrating-image2.8
56/100
rating-image3.4
67/100
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-image3.8
75/100
rating-image3.4
68/100
Processing capabilityrating-image4.6
91/100
rating-image4.5
90/100
Memory capacityrating-image4.7
93/100
rating-image4.5
90/100
Storage capacityrating-image4.6
91/100
rating-image4.5
90/100
Rear camera functionrating-image4.9
97/100
rating-image3.0
59/100
Front camera functionrating-image4.9
97/100
rating-image3.5
70/100

Compare Performance and Usability

Size comparison of "vivo S1 Pro (China) 256GB" and "vivo X21 UD (2018) 128GB". 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 S1 Pro (China) 256GB" is 74.7mm wide, 157.3mm tall, and 8.2mm thick. The "vivo X21 UD (2018) 128GB" is 74.8mm tall, 154.5mm wide, and 7.4mm thick.

There is no real difference between the "vivo S1 Pro (China) 256GB" and "vivo X21 UD (2018) 128GB" 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 S1 Pro (China) 256GB" and "vivo X21 UD (2018) 128GB", 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 S1 Pro (China) 256GB"and "vivo X21 UD (2018) 128GB". 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 S1 Pro (China) 256GB62/10074.7mm x 157.3mm x 8.2mm
vivo X21 UD (2018) 128GB64/10074.8mm x 154.5mm x 7.4mm

Which one is easier to hold, "vivo S1 Pro (China) 256GB" or "vivo X21 UD (2018) 128GB"? 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 S1 Pro (China) 256GB" weighs 185.0g. The "vivo X21 UD (2018) 128GB" clocks in at 156.2g. If you compare the weight of the two, the "vivo X21 UD (2018) 128GB" is a considerably lighter smartphone than the "vivo S1 Pro (China) 256GB", with a difference of about 28.8g. Because of this, the "vivo X21 UD (2018) 128GB" puts less of a burden on the fingers and wrists than the "vivo S1 Pro (China) 256GB". 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 "vivo X21 UD (2018) 128GB" rather than the "vivo S1 Pro (China) 256GB".

ScoreWeight
vivo S1 Pro (China) 256GB56/100185.0g
vivo X21 UD (2018) 128GB67/100156.2g

Which is better in terms of display, "vivo S1 Pro (China) 256GB" or "vivo X21 UD (2018) 128GB"?

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 S1 Pro (China) 256GB" is 6.39inch, and 6.28inch on the "vivo X21 UD (2018) 128GB". The screens of the "vivo S1 Pro (China) 256GB" and "vivo X21 UD (2018) 128GB" 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 S1 Pro (China) 256GB90/1006.39inch
vivo X21 UD (2018) 128GB90/1006.28inch

Which one has a better display, "vivo S1 Pro (China) 256GB" or "vivo X21 UD (2018) 128GB"?

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 S1 Pro (China) 256GB" has a 1080 x 2340 resolution and a pixel density of 403ppi. The "vivo X21 UD (2018) 128GB", on the other hand, has a screen resolution of 1080 x 2280 and a pixel density of 401ppi. There is not much of a difference in the pixel resolutions of the "vivo S1 Pro (China) 256GB" and "vivo X21 UD (2018) 128GB", 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 S1 Pro (China) 256GB84/100403ppi
vivo X21 UD (2018) 128GB84/100401ppi

How is the battery duration of "vivo S1 Pro (China) 256GB" different from that of "vivo X21 UD (2018) 128GB" ? 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 "vivo S1 Pro (China) 256GB" has a battery capacity of 3700.0mAh, while the "vivo X21 UD (2018) 128GB" has a 3200.0mAh battery. Regarding the battery performance, the "vivo S1 Pro (China) 256GB" has a larger battery capacity than the "vivo X21 UD (2018) 128GB", with a difference of 500mAh. If you are choosing based on the battery, the "vivo S1 Pro (China) 256GB" is recommended over the "vivo X21 UD (2018) 128GB".

ScoreBattery capacity
vivo S1 Pro (China) 256GB75/1003700.0mAh
vivo X21 UD (2018) 128GB68/1003200.0mAh

Which is better in terms of CPU function, "vivo S1 Pro (China) 256GB" or "vivo X21 UD (2018) 128GB"?

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 S1 Pro (China) 256GB" is equipped with a Qualcomm SDM675 Snapdragon 675 processor, and its performance speed is 2.0GHz+1.7GHz×8(8.0-cores). The "vivo X21 UD (2018) 128GB" uses an Qualcomm SDM660 Snapdragon 660 CPU that performs at a speed of 2.2GHz+1.8GHz×8(8.0-cores). There is also no real discrepancy between the CPU performances of the "vivo S1 Pro (China) 256GB" and "vivo X21 UD (2018) 128GB". 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 S1 Pro (China) 256GB91/1002.0GHz+1.7GHz×8(8.0-cores)
vivo X21 UD (2018) 128GB90/1002.2GHz+1.8GHz×8(8.0-cores)

How is "vivo S1 Pro (China) 256GB" different from "vivo X21 UD (2018) 128GB" 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 S1 Pro (China) 256GB" has 8.0GB of memory. The "vivo X21 UD (2018) 128GB", on the other hand, has 6.0GB. Memory performance is roughly the same for both the "vivo S1 Pro (China) 256GB" and "vivo X21 UD (2018) 128GB"; 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 S1 Pro (China) 256GB93/1008.0GB
vivo X21 UD (2018) 128GB90/1006.0GB

Which has a better storage capacity, "vivo S1 Pro (China) 256GB" or "vivo X21 UD (2018) 128GB"?

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 S1 Pro (China) 256GB" has 256.0GB of storage, while the "vivo X21 UD (2018) 128GB" has 128.0GB. There is no real difference between the "vivo S1 Pro (China) 256GB"and "vivo X21 UD (2018) 128GB" '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 S1 Pro (China) 256GB91/100256.0GB
vivo X21 UD (2018) 128GB90/100128.0GB

Compare the rear cameras of "vivo S1 Pro (China) 256GB" and "vivo X21 UD (2018) 128GB". 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 S1 Pro (China) 256GB" has 48.0MP. The "vivo X21 UD (2018) 128GB" has 12.0MP. The rear-facing camera of the "vivo S1 Pro (China) 256GB" also has a higher pixel count than the "vivo X21 UD (2018) 128GB", with a difference of about 36MP. The "vivo S1 Pro (China) 256GB" is more capable than the "vivo X21 UD (2018) 128GB" of taking high-definition photos and videos, and produces better results when printing out the photos you have taken. If you want a smartphone that is designed for video and photography, we recommend buying the "vivo S1 Pro (China) 256GB" rather than the "vivo X21 UD (2018) 128GB".

ScoreRear-camera resolution
vivo S1 Pro (China) 256GB97/10048.0MP
vivo X21 UD (2018) 128GB59/10012.0MP

Which has a front camera with better picture quality, "vivo S1 Pro (China) 256GB" or "vivo X21 UD (2018) 128GB"?

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 S1 Pro (China) 256GB" has a resolution of 32.0MP. The "vivo X21 UD (2018) 128GB"'s has 12.0MP. The front-facing camera of the "vivo S1 Pro (China) 256GB" has a significantly higher number of pixels than the "vivo X21 UD (2018) 128GB", with a difference of about 20MP. Therefore, the "vivo S1 Pro (China) 256GB" is more suitable for taking photos and videos than the "vivo X21 UD (2018) 128GB". If you want to take and print high-quality selfies, we recommend buying the "vivo S1 Pro (China) 256GB" rather than the "vivo X21 UD (2018) 128GB".

ScoreFront-camera resolution
vivo S1 Pro (China) 256GB97/10032.0MP
vivo X21 UD (2018) 128GB70/10012.0MP

Compare Performance Specs

vivo S1 Pro (China) 256GBvivo X21 UD (2018) 128GB
Imagevivo S1 Pro (China) 256GBvivo X21 UD (2018) 128GB
Makervivovivo
Release date2019-052018-03
ColorBlue/Red/Midsummer dreamBlack/Ruby Red
OSAndroidAndroid
Dimensions (width x height x thickness)74.7mm x 157.3mm x 8.2mm74.8mm x 154.5mm x 7.4mm
Weight185.0g156.2g
Display size6.39inch6.28inch
Display typeSuper AMOLEDSuper AMOLED
Screen resolution (width x height)1080 x 23401080 x 2280
Pixel density403ppi401ppi
Battery capacity3700.0mAh3200.0mAh
ChipsetQualcomm SDM675 Snapdragon 675Qualcomm SDM660 Snapdragon 660
CPU specs2.0GHz+1.7GHz×8(8.0-cores)2.2GHz+1.8GHz×8(8.0-cores)
RAM size8.0GB6.0GB
Storage size256.0GB128.0GB
Rear-camera resolution48.0MP12.0MP
Front-camera resolution32.0MP12.0MP

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