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Oppo A31 (2020) 128GB vs vivo X21 UD (2018) 128GB: Full Comparison!

Created date: 2020-02-13 20:55:33, Updated date: 2021-10-20 18:13:41

Oppo A31 (2020) 128GBvivo X21 UD (2018) 128GB
Oppo A31 (2020) 128GBvivo X21 UD (2018) 128GB

Which do we recommend after comparing the "Oppo A31 (2020) 128GB" and "vivo X21 UD (2018) 128GB"? We evaluated the differences between the two models. This article is recommended for those who are trying to choose between the "Oppo A31 (2020) 128GB" and "vivo X21 UD (2018) 128GB".

Oppo A31 (2020) 128GBvivo X21 UD (2018) 128GB
Oppo A31 (2020) 128GB

vivo X21 UD (2018) 128GB

General rating:
Griprating-image2.7
53/100
rating-image3.0
59/100
Screen qualityrating-image3.4
68/100
rating-image4.0
79/100
Performancerating-image4.5
89/100
rating-image4.8
96/100
Storage sizerating-image4.5
90/100
rating-image4.5
90/100
Batteryrating-image5.0
100/100
rating-image4.5
90/100
Rear-camera resolutionrating-image3.5
70/100
rating-image3.5
70/100
Front-camera resolutionrating-image4.0
80/100
rating-image5.0
100/100

What is the difference between the "Oppo A31 (2020) 128GB" and the "vivo X21 UD (2018) 128GB"? See a detailed comparison of ease of use and performance

Comparison of weight and size of the "Oppo A31 (2020) 128GB" and "vivo X21 UD (2018) 128GB"

The design of Oppo A31 (2020) 128GB

The "Oppo A31 (2020) 128GB" is 163.9mm long, 75.5mm wide, and 8.3mm thick. It weighs 180.0g.

The design of vivo X21 UD (2018) 128GB

The "vivo X21 UD (2018) 128GB" is 154.5mm long, 74.8mm wide, and 7.4mm thick. It weighs 156.2g.

Which is the better design to use?

In comparison, the size difference is 9.4mm in length, 0.7mm in width, and 0.9mm in thickness. Both the "Oppo A31 (2020) 128GB" and "vivo X21 UD (2018) 128GB" are equally easy to use with one hand. Hiragana flick input is basically just as easy to use with "Oppo A31 (2020) 128GB" and "vivo X21 UD (2018) 128GB". Both the "Oppo A31 (2020) 128GB" and "vivo X21 UD (2018) 128GB" are basically equally portable and easy to handle.

The difference in weight is 23.8g. The "vivo X21 UD (2018) 128GB" is much lighter, putting less burden on the hand.

Oppo A31 (2020) 128GB

vivo X21 UD (2018) 128GB

Ease of holding it in one hand63/10066/100
How much it does not feel heavy to hold in one hand32/10048/100
Ease of carrying around59/10061/100

Compare the display of the "Oppo A31 (2020) 128GB" and "vivo X21 UD (2018) 128GB"

Display of the Oppo A31 (2020) 128GB

The "Oppo A31 (2020) 128GB" uses a IPS LCD liquid crystal. The resolution is 720 x 1600, and the pixel density is 269ppi. The "Oppo A31 (2020) 128GB" has a 6.5inch screen size.

Display of the vivo X21 UD (2018) 128GB

The "vivo X21 UD (2018) 128GB" uses a Super AMOLED liquid crystal. The resolution is 1080 x 2280, and the pixel density is 401ppi. The "vivo X21 UD (2018) 128GB" has a 6.28inch screen size.

Which has a better screen?

This makes a 0.21inch difference in the display sizes. When actually viewing the two phones' onscreen displays, it is obvious that they are roughly the same size. For doing internet research using systems such as SNS, there is not much difference between the two phones. Both the "Oppo A31 (2020) 128GB" and the "vivo X21 UD (2018) 128GB" can be easily used for this kind of purpose. The gaming screens of these two phones are roughly the same size. Both the "Oppo A31 (2020) 128GB" and the "vivo X21 UD (2018) 128GB" can be easily used for this kind of purpose.

In terms of display, the "vivo X21 UD (2018) 128GB" is a better choice for those looking to use their phone for browsing the web or for gaming. When using the smartphone as a VR, the screen is generally held much closer to the face than when using the smartphone for other purposes, and so the clarity of the screen becomes a rather important factor. The "vivo X21 UD (2018) 128GB" also offers a crisp, cleaner display when using a VR headset than the "Oppo A31 (2020) 128GB". The "Oppo A31 (2020) 128GB" has the performance needed for this kind of purpose.

Oppo A31 (2020) 128GB

vivo X21 UD (2018) 128GB

How suited is the screen for usual usage?80/10078/100
How suited is the screen to play games on?84/10082/100

Compare the camera performances of the "Oppo A31 (2020) 128GB" and "vivo X21 UD (2018) 128GB"

Camera performance of Oppo A31 (2020) 128GB

The main camera of the "Oppo A31 (2020) 128GB" has 12.0MP. The front camera has 8.0MP.

Camera performance of vivo X21 UD (2018) 128GB

The main camera of the "vivo X21 UD (2018) 128GB" has 12.0MP. The front camera has 12.0MP.

Which camera performance is better?

There is very little difference in the performance (or pixel count) of "Oppo A31 (2020) 128GB" and "vivo X21 UD (2018) 128GB" when shooting distant objects or Instagrammable landscapes. Also, when using the rear camera to snap close shots of photogenic sweets or meals, there is very little difference between the pixel counts of the two phones. Both the "Oppo A31 (2020) 128GB" and the "vivo X21 UD (2018) 128GB" can be easily used for this kind of purpose.

There is a 4MP difference in front camera pixel number. The "vivo X21 UD (2018) 128GB"'s front camera also works terrifically well with selfie sticks and for capturing distant objects like the background scenery in your selfies. The "vivo X21 UD (2018) 128GB" has the necessary specs for this kind of purpose. The "vivo X21 UD (2018) 128GB"'s front camera has a more suitable megapixel count for shooting objects up close for selfies and such.

Oppo A31 (2020) 128GB

vivo X21 UD (2018) 128GB

Is is suited to taking far away objects with the rear camera?70/10070/100
Is it suited for taking close objects with the built-in camera?80/100100/100

Comparison of the processing capabilities of the "Oppo A31 (2020) 128GB" and "vivo X21 UD (2018) 128GB"

The processing capability of the Oppo A31 (2020) 128GB

Performance is defined by the chipset, and the "Oppo A31 (2020) 128GB" uses the Mediatek MT6765V/CB Helio P35 SoC. The CPU performance is 2.3GHz+1.8GHz×8(8.0-cores). The memory capacity is 4.0GB.

The processing capability of the vivo X21 UD (2018) 128GB

Performance is defined by the chipset, and the "vivo X21 UD (2018) 128GB" uses the Qualcomm SDM660 Snapdragon 660 SoC. The CPU performance is 2.2GHz+1.8GHz×8(8.0-cores). The memory capacity is 6.0GB.

Which has the better processing capability?

As compared to the "Oppo A31 (2020) 128GB", the "vivo X21 UD (2018) 128GB" boasts boasts a better CPU and specs. This is a 2GB difference in memory capacity. The memory of "vivo X21 UD (2018) 128GB" is slightly larger, so "vivo X21 UD (2018) 128GB" is recommended over "Oppo A31 (2020) 128GB" for multitasking.

For using fundamental features such as calls, emails, messages and using SNS, I am more inclined to recommend the "vivo X21 UD (2018) 128GB". For people who mainly use their phones to look things up online, watch videos and play games occasionally I can recommend the "Oppo A31 (2020) 128GB" and the "vivo X21 UD (2018) 128GB" equally. Both the "Oppo A31 (2020) 128GB" and the "vivo X21 UD (2018) 128GB" can be easily used for this kind of purpose.

For playing 2D and simpler 3D games, "vivo X21 UD (2018) 128GB" is more suitable as the games are less likely to stall. For playing more memory-intensive 3D games, it is better to go with "vivo X21 UD (2018) 128GB" as it has better performance. Both the "Oppo A31 (2020) 128GB" and the "vivo X21 UD (2018) 128GB" can be easily used for this kind of purpose.

Oppo A31 (2020) 128GB

vivo X21 UD (2018) 128GB

Review on the CPU capbility and memory capacity when using Social Networks or the Internet91/10098/100
Review on the CPU speed and the memory capacity while playing 3D games85/10094/100

Comparison of the battery life of the "Oppo A31 (2020) 128GB" and "vivo X21 UD (2018) 128GB"

Battery performance of Oppo A31 (2020) 128GB

The "Oppo A31 (2020) 128GB" has a battery capacity of 4230.0mAh.

Battery performance of vivo X21 UD (2018) 128GB

The "vivo X21 UD (2018) 128GB" has a battery capacity of 3200.0mAh.

Which battery perfomances is better?

This makes a difference in battery capacity of 1030mAh, but it is not enough to only compare the capacity. With a high-performance CPU, the battery drains faster, and a larger screen also uses more battery.

The "Oppo A31 (2020) 128GB" is also a great choice for those who only use their phone for occasional phone calls or for checking the time. For people who tend to use their phone for looking up things on the internet, checking up on social media, or playing the occasional game, I recommend the "Oppo A31 (2020) 128GB" over the "vivo X21 UD (2018) 128GB". Both the "Oppo A31 (2020) 128GB" and the "vivo X21 UD (2018) 128GB" can be easily used for this kind of purpose.

The battery life of the "Oppo A31 (2020) 128GB" is well equipped to handle long hours of gaming, video playback, and other kinds of frequent daily use. Both the "Oppo A31 (2020) 128GB" and the "vivo X21 UD (2018) 128GB" can be easily used for this kind of purpose.

Oppo A31 (2020) 128GB

vivo X21 UD (2018) 128GB

Review on the battery life of a phone mainly using Social Networks and the Internet100/10090/100
Review on the battery life of a phone mainly using mainly games and videos100/10078/100

Compare the storage capacity of the "Oppo A31 (2020) 128GB" and "vivo X21 UD (2018) 128GB"

The storage capacity of the Oppo A31 (2020) 128GB

The "Oppo A31 (2020) 128GB" has 128.0GB of internal memory. It is also compatible with SD cards, so when there is insufficient storage space, then a SD card can be used to add more storage.

The storage capacity of the vivo X21 UD (2018) 128GB

The "vivo X21 UD (2018) 128GB" has 128.0GB of internal memory. It is also compatible with SD cards, so when there is insufficient storage space, then a SD card can be used to add more storage. A SD with a maximum of 256.0GB can be used.

Which has the easier storage to use?

If you are only downloading a few games and apps (such as SNS) to use on your phone, it really doesn't matter if you choose "Oppo A31 (2020) 128GB" or "vivo X21 UD (2018) 128GB". If you are hoping to install many different games on their phone, the amount of storage is the same no matter which of these two devices you choose to buy. Both the "Oppo A31 (2020) 128GB" and the "vivo X21 UD (2018) 128GB" can be easily used for this kind of purpose.

Because the speed of loading from or saving to the SD card is slow, it is suited for saving pictures or videos.

Oppo A31 (2020) 128GB

vivo X21 UD (2018) 128GB

Review on the storage capacity when playing many games90/10090/100
Review on when you store many pictures and videos - 92/100

Which to buy, the "Oppo A31 (2020) 128GB" or "vivo X21 UD (2018) 128GB"

At the end of the day which is better, the "Oppo A31 (2020) 128GB" or "vivo X21 UD (2018) 128GB"?

"vivo X21 UD (2018) 128GB" is easier for the user to hold and is more compact, and so it is recommended. Its perfect screen size of 6.28inch makes the "vivo X21 UD (2018) 128GB" a lot easier to use. "vivo X21 UD (2018) 128GB" is better for users who prefer better functionality and specs. When comparing "vivo X21 UD (2018) 128GB" and "Oppo A31 (2020) 128GB" overall, "vivo X21 UD (2018) 128GB" is a more balanced model and is recommended.

Oppo A31 (2020) 128GB

vivo X21 UD (2018) 128GB

Handling53/10059/100
Display68/10079/100
CPU specs89/10096/100
General rating75/10081/100

Is it recommended to buy the Oppo A31 (2020) 128GB, compared with other smartphones?

Compared to other smartphones, the "Oppo A31 (2020) 128GB" is averagely easy to hold. Although it can be a little difficult, it is the right size to be able to operate with one hand. The screen size is larger than that of standard smartphones. It is suited for typing long texts and so can be used to read or edit office texts. In addition, its processing capability is quite excellent compared to the average smart phone. It is suitable for almost all uses, including games and VR. It may be a bit extravagant for normal use. Looking at the overall specifications, the "Oppo A31 (2020) 128GB" is a middle-range to high-end smart phone.

Is it recommended to buy the vivo X21 UD (2018) 128GB, compared with other smartphones?

Compared to other smartphones, the "vivo X21 UD (2018) 128GB" is averagely easy to hold. Although it can be a little difficult, it is the right size to be able to operate with one hand. The screen size is larger than that of standard smartphones. It is suited for typing long texts and so can be used to read or edit office texts. In addition, its processing capability is quite excellent compared to the average smart phone. It is suitable for almost all uses, including games and VR. It may be a bit extravagant for normal use. Looking at the overall specifications, the "vivo X21 UD (2018) 128GB" is a high-end smart phone.

What are the spec differences between the "Oppo A31 (2020) 128GB" and "vivo X21 UD (2018) 128GB" ?

A summary of the technical specifications of the "Oppo A31 (2020) 128GB" and "vivo X21 UD (2018) 128GB". Functions and performance variations on the same model will be highlighted in red.

Oppo A31 (2020) 128GBvivo X21 UD (2018) 128GB
Oppo A31 (2020) 128GBvivo X21 UD (2018) 128GB
ColorFantasy White/Mystery BlackBlack/Ruby Red
OSAndroidAndroid
Dimensions (width x height x thickness)75.5mm x 163.9mm x 8.3mm74.8mm x 154.5mm x 7.4mm
Weight180.0g156.2g
Display size6.5inch6.28inch
Display typeIPS LCDSuper AMOLED
Screen resolution (width x height)720 x 16001080 x 2280
Pixel density269ppi401ppi
Battery capacity4230.0mAh3200.0mAh
ChipsetMediatek MT6765V/CB Helio P35Qualcomm SDM660 Snapdragon 660
CPU specs2.3GHz+1.8GHz×8(8.0-cores)2.2GHz+1.8GHz×8(8.0-cores)
RAM size4.0GB6.0GB
Storage size128.0GB128.0GB
Rear-camera resolution12.0MP12.0MP
Front-camera resolution8.0MP12.0MP

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