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Should you buy vivo Y91 (2018) 32GB or vivo X20 Plus UD 128GB? Compare the differences in functions and specifications/performances thoroughly

Created date: 2018-12-16 00:23:00, Updated date: 2020-04-16 14:30:36

vivo Y91 (2018) 32GBvivo X20 Plus UD 128GB
vivo Y91 (2018) 32GBvivo X20 Plus UD 128GB

Are you having trouble comparing the differences in features and performance of the "vivo Y91 (2018) 32GB" and "vivo X20 Plus UD 128GB", 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 Y91 (2018) 32GBvivo X20 Plus UD 128GB
vivo Y91 (2018) 32GB

vivo X20 Plus UD 128GB

General rating:

63.5/100

(The 3620th of all smartphones)

69.1/100

(The 1065th of all smartphones)

Portability
62/100
54/100
Weight
64/100
57/100
Size of screen
90/100
90/100
Screen clarity
54/100
79/100
Battery duration
80/100
78/100
Processing capability
71/100
86/100
Memory capacity
60/100
70/100
Storage capacity
55/100
90/100
Rear camera function
61/100
59/100
Front camera function
58/100
70/100

Compare Performance and Usability

Size comparison of "vivo Y91 (2018) 32GB" and "vivo X20 Plus UD 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 Y91 (2018) 32GB" is 75.1mm wide, 155.1mm tall, and 8.3mm thick. The "vivo X20 Plus UD 128GB" is 80.1mm tall, 155.3mm wide, and 7.5mm thick.

Comparing the width and thickness of the main unit, the "vivo Y91 (2018) 32GB" is smaller and more compact compared to the "vivo X20 Plus UD 128GB". Therefore, it is easier to grip and hold the "vivo Y91 (2018) 32GB" than the "vivo X20 Plus UD 128GB". For this reason, the "vivo Y91 (2018) 32GB" is recommended.

There is no real difference in length or width between the "vivo Y91 (2018) 32GB" and "vivo X20 Plus UD 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 Y91 (2018) 32GB"and "vivo X20 Plus UD 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 Y91 (2018) 32GB62/10075.1mm x 155.1mm x 8.3mm
vivo X20 Plus UD 128GB54/10080.1mm x 155.3mm x 7.5mm

Which one is easier to hold, "vivo Y91 (2018) 32GB" or "vivo X20 Plus UD 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 Y91 (2018) 32GB" weighs 163.5g. The "vivo X20 Plus UD 128GB" clocks in at 181.5g. Comparing the weight of the main unit, the "vivo Y91 (2018) 32GB" is a lighter phone than the "vivo X20 Plus UD 128GB", with a difference of approximately 18g. Therefore, there is less strain on your fingers and wrists even when you use your phone for a long time on the "vivo Y91 (2018) 32GB" compared to the "vivo X20 Plus UD 128GB". For this reason, the "vivo Y91 (2018) 32GB" is recommended.

ScoreWeight
vivo Y91 (2018) 32GB64/100163.5g
vivo X20 Plus UD 128GB57/100181.5g

Which is better in terms of display, "vivo Y91 (2018) 32GB" or "vivo X20 Plus UD 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 Y91 (2018) 32GB" is 6.22inch, and 6.43inch on the "vivo X20 Plus UD 128GB". The screens of the "vivo Y91 (2018) 32GB" and "vivo X20 Plus UD 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 Y91 (2018) 32GB90/1006.22inch
vivo X20 Plus UD 128GB90/1006.43inch

Which one has a better display, "vivo Y91 (2018) 32GB" or "vivo X20 Plus UD 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 Y91 (2018) 32GB" has a 720 x 1520 resolution and a pixel density of 270ppi. The "vivo X20 Plus UD 128GB", on the other hand, has a screen resolution of 1080 x 2160 and a pixel density of 375ppi. Comparing the screen definition, the "vivo X20 Plus UD 128GB" has a much higher pixel density than the "vivo Y91 (2018) 32GB", with a difference of about 105ppi. The screen on the "vivo X20 Plus UD 128GB" is clear and crisp, and puts less strain on the eyes than that of the "vivo Y91 (2018) 32GB". If you want to choose a smartphone that is gentle on your eyes with a display that shows text and images clearly, we recommend that you buy the "vivo X20 Plus UD 128GB" rather than the "vivo Y91 (2018) 32GB".

ScorePixel density
vivo Y91 (2018) 32GB54/100270ppi
vivo X20 Plus UD 128GB79/100375ppi

How is the battery duration of "vivo Y91 (2018) 32GB" different from that of "vivo X20 Plus UD 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 Y91 (2018) 32GB" has a battery capacity of 4030.0mAh, while the "vivo X20 Plus UD 128GB" has a 3900.0mAh battery. The batteries of both the "vivo Y91 (2018) 32GB" and "vivo X20 Plus UD 128GB" perform to the same extent. There is also no difference in the battery capacities of the "vivo Y91 (2018) 32GB" and the "vivo X20 Plus UD 128GB". Since their battery life is practically identical, it would be better to compare them based on other aspects of performance and function.

ScoreBattery capacity
vivo Y91 (2018) 32GB80/1004030.0mAh
vivo X20 Plus UD 128GB78/1003900.0mAh

Which is better in terms of CPU function, "vivo Y91 (2018) 32GB" or "vivo X20 Plus UD 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 Y91 (2018) 32GB" is equipped with a Qualcomm SDM439 Snapdragon 439 processor, and its performance speed is 1.95GHz+1.45GHz×8(8.0-cores). The "vivo X20 Plus UD 128GB" uses an Qualcomm SDM660 Snapdragon 660 CPU that performs at a speed of 2.2GHz+1.8GHz×8(8.0-cores). Comparing CPU performance, the "vivo X20 Plus UD 128GB" has significantly higher specs than the "vivo Y91 (2018) 32GB". The "vivo X20 Plus UD 128GB" proves to be more advanced than the "vivo Y91 (2018) 32GB" in the way that apps run quickly and games play smoothly. If you're looking for a high-spec smartphone that runs quickly and plays games smoothly, we recommend that you buy the "vivo X20 Plus UD 128GB" rather than the "vivo Y91 (2018) 32GB".

ScoreCPU specs
vivo Y91 (2018) 32GB71/1001.95GHz+1.45GHz×8(8.0-cores)
vivo X20 Plus UD 128GB86/1002.2GHz+1.8GHz×8(8.0-cores)

How is "vivo Y91 (2018) 32GB" different from "vivo X20 Plus UD 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 Y91 (2018) 32GB" has 3.0GB of memory. The "vivo X20 Plus UD 128GB", on the other hand, has 4.0GB. As for memory performance, the "vivo X20 Plus UD 128GB" has a larger memory capacity than the "vivo Y91 (2018) 32GB", with a difference of about 1GB. The "vivo X20 Plus UD 128GB" has better multitasking, less crashing, and runs 3D games and VR video better than the "vivo Y91 (2018) 32GB". If you're looking for a smartphone that will remain stable even when you are using multiple apps at the same time, and which will allow you to play 3D games and VR video comfortably, we recommend that you buy the "vivo X20 Plus UD 128GB" rather than the "vivo Y91 (2018) 32GB".

ScoreRAM size
vivo Y91 (2018) 32GB60/1003.0GB
vivo X20 Plus UD 128GB70/1004.0GB

Which has a better storage capacity, "vivo Y91 (2018) 32GB" or "vivo X20 Plus UD 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 Y91 (2018) 32GB" has 32.0GB of storage, while the "vivo X20 Plus UD 128GB" has 128.0GB. In terms of ROM and data storage, the "vivo X20 Plus UD 128GB" has a much larger capacity than the "vivo Y91 (2018) 32GB", with a difference of about 96GB. The "vivo X20 Plus UD 128GB" can save more photos and keep more apps installed than the "vivo Y91 (2018) 32GB". If you're searching for a smartphone that can store more data, we recommended that you buy the "vivo X20 Plus UD 128GB" rather than the "vivo Y91 (2018) 32GB".

ScoreStorage size
vivo Y91 (2018) 32GB55/10032.0GB
vivo X20 Plus UD 128GB90/100128.0GB

Compare the rear cameras of "vivo Y91 (2018) 32GB" and "vivo X20 Plus UD 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 Y91 (2018) 32GB" has 13.0MP. The "vivo X20 Plus UD 128GB" has 12.0MP. The rear facing cameras of the "vivo Y91 (2018) 32GB" and "vivo X20 Plus UD 128GB" 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 Y91 (2018) 32GB61/10013.0MP
vivo X20 Plus UD 128GB59/10012.0MP

Which has a front camera with better picture quality, "vivo Y91 (2018) 32GB" or "vivo X20 Plus UD 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 Y91 (2018) 32GB" has a resolution of 8.0MP. The "vivo X20 Plus UD 128GB"'s has 12.0MP. The front-facing camera of the "vivo X20 Plus UD 128GB" has a significantly higher number of pixels than the "vivo Y91 (2018) 32GB", with a difference of about 4MP. Therefore, the "vivo X20 Plus UD 128GB" is more suitable for taking photos and videos than the "vivo Y91 (2018) 32GB". If you want to take and print high-quality selfies, we recommend buying the "vivo X20 Plus UD 128GB" rather than the "vivo Y91 (2018) 32GB".

ScoreFront-camera resolution
vivo Y91 (2018) 32GB58/1008.0MP
vivo X20 Plus UD 128GB70/10012.0MP

Compare Performance Specs

vivo Y91 (2018) 32GBvivo X20 Plus UD 128GB
Imagevivo Y91 (2018) 32GBvivo X20 Plus UD 128GB
Makervivovivo
Release date2018-112018-01
ColorStarry Black/Ocean BlueMatte Black/Gold/Rose gold
OSAndroidAndroid
Dimensions (width x height x thickness)75.1mm x 155.1mm x 8.3mm80.1mm x 155.3mm x 7.5mm
Weight163.5g181.5g
Display size6.22inch6.43inch
Display typeIPS LCDSuper AMOLED
Screen resolution (width x height)720 x 15201080 x 2160
Pixel density270ppi375ppi
Battery capacity4030.0mAh3900.0mAh
ChipsetQualcomm SDM439 Snapdragon 439Qualcomm SDM660 Snapdragon 660
CPU specs1.95GHz+1.45GHz×8(8.0-cores)2.2GHz+1.8GHz×8(8.0-cores)
RAM size3.0GB4.0GB
Storage size32.0GB128.0GB
Rear-camera resolution13.0MP12.0MP
Front-camera resolution8.0MP12.0MP

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