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ZTE Speed (2014) 8GB vs. vivo X21 UD (2018) 128GB Specs & Scores

Created date: 2018-09-30 23:21:11, Updated date: 2021-10-20 19:12:28

ZTE Speed (2014) 8GBvivo X21 UD (2018) 128GB
ZTE Speed (2014) 8GBvivo X21 UD (2018) 128GB

Here's our thorough comparison of the difference in performance and function between the "ZTE Speed (2014) 8GB" and "vivo X21 UD (2018) 128GB". Which one should you buy? We'll compare and explain what differs between the "ZTE Speed (2014) 8GB" and "vivo X21 UD (2018) 128GB" in a way that even people who aren't used to choosing between two similar products can understand.

ZTE Speed (2014) 8GBvivo X21 UD (2018) 128GB
ZTE Speed (2014) 8GB

vivo X21 UD (2018) 128GB

General rating:
Portabilityrating-image3.7
74/100
rating-image3.2
64/100
Weightrating-image3.8
75/100
rating-image3.4
67/100
Size of screenrating-image3.3
66/100
rating-image4.5
90/100
Screen clarityrating-image2.4
47/100
rating-image4.2
84/100
Battery durationrating-image2.5
50/100
rating-image3.4
68/100
Processing capabilityrating-image1
14/100
rating-image4.5
90/100
Memory capacityrating-image1.0
20/100
rating-image4.5
90/100
Storage capacityrating-image1.2
24/100
rating-image4.5
90/100
Rear camera functionrating-image1.4
27/100
rating-image3.0
59/100
Front camera functionrating-image1
15/100
rating-image3.5
70/100

Compare Performance and Usability

Size comparison of "ZTE Speed (2014) 8GB" 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 "ZTE Speed (2014) 8GB" is 66.0mm wide, 134.6mm tall, and 10.2mm thick. The "vivo X21 UD (2018) 128GB" is 74.8mm tall, 154.5mm wide, and 7.4mm thick.

The "ZTE Speed (2014) 8GB" is also more compact than the "vivo X21 UD (2018) 128GB" in terms of the thickness of the devices. The "ZTE Speed (2014) 8GB" is easier than the "vivo X21 UD (2018) 128GB" to hold with one hand, and you are less likely to accidentally drop it. If you're looking for a smartphone that fits nicely in your hand and can be gripped firmly, we recommend buying the "ZTE Speed (2014) 8GB" rather than the "vivo X21 UD (2018) 128GB".

Comparing the width and height of the devices, the "ZTE Speed (2014) 8GB" is more compact than the "vivo X21 UD (2018) 128GB". The "ZTE Speed (2014) 8GB" is easier to carry around than the "vivo X21 UD (2018) 128GB" and easier to use with one hand. For a smartphone that is comfortable and easy to operate with one hand, and can fit neatly in your pocket or bag, we recommend that you buy the "ZTE Speed (2014) 8GB" rather than the "vivo X21 UD (2018) 128GB".

Comparing the overall sizes, the "ZTE Speed (2014) 8GB" is significantly smaller than the "vivo X21 UD (2018) 128GB". The "ZTE Speed (2014) 8GB" is more convenient than the "vivo X21 UD (2018) 128GB" to use with one hand, and it is less likely to get in your way when not using it. If you prefer a smartphone that is easy to carry around and easy to use with one hand, we recommend that you buy the "ZTE Speed (2014) 8GB" rather than the "vivo X21 UD (2018) 128GB".

ScoreDimensions (width x height x thickness)
ZTE Speed (2014) 8GB74/10066.0mm x 134.6mm x 10.2mm
vivo X21 UD (2018) 128GB64/10074.8mm x 154.5mm x 7.4mm

Which one is easier to hold, "ZTE Speed (2014) 8GB" 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 "ZTE Speed (2014) 8GB" weighs 136.1g. The "vivo X21 UD (2018) 128GB" clocks in at 156.2g. Comparing the weight of the main unit, the "ZTE Speed (2014) 8GB" is a lighter phone than the "vivo X21 UD (2018) 128GB", with a difference of approximately 20g. Therefore, there is less strain on your fingers and wrists even when you use your phone for a long time on the "ZTE Speed (2014) 8GB" compared to the "vivo X21 UD (2018) 128GB". For this reason, the "ZTE Speed (2014) 8GB" is recommended.

ScoreWeight
ZTE Speed (2014) 8GB75/100136.1g
vivo X21 UD (2018) 128GB67/100156.2g

Which is better in terms of display, "ZTE Speed (2014) 8GB" 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 "ZTE Speed (2014) 8GB" is 4.5inch, and 6.28inch on the "vivo X21 UD (2018) 128GB". Comparing the sizes of the screens and displays, the "vivo X21 UD (2018) 128GB" is considerably larger than the "ZTE Speed (2014) 8GB", with a difference of about 1.78inch. Compared to the "ZTE Speed (2014) 8GB", the "vivo X21 UD (2018) 128GB" makes buttons in apps easier to press, and the visuals look more impressive in videos and games. The larger screen of the "vivo X21 UD (2018) 128GB" also has the advantage of being less tiring on the eyes. If you want to avoid tapping the wrong place, enjoy videos and games on a large screen, and not get tired eyes while using it, we recommend that you buy the "vivo X21 UD (2018) 128GB" rather than the "ZTE Speed (2014) 8GB".

ScoreDisplay size
ZTE Speed (2014) 8GB66/1004.5inch
vivo X21 UD (2018) 128GB90/1006.28inch

Which one has a better display, "ZTE Speed (2014) 8GB" 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 "ZTE Speed (2014) 8GB" has a 540 x 960 resolution and a pixel density of 244ppi. The "vivo X21 UD (2018) 128GB", on the other hand, has a screen resolution of 1080 x 2280 and a pixel density of 401ppi. Comparing the screen definition, the "vivo X21 UD (2018) 128GB" has a much higher pixel density than the "ZTE Speed (2014) 8GB", with a difference of about 157ppi. The screen on the "vivo X21 UD (2018) 128GB" is clear and crisp, and puts less strain on the eyes than that of the "ZTE Speed (2014) 8GB". 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 X21 UD (2018) 128GB" rather than the "ZTE Speed (2014) 8GB".

ScorePixel density
ZTE Speed (2014) 8GB47/100244ppi
vivo X21 UD (2018) 128GB84/100401ppi

How is the battery duration of "ZTE Speed (2014) 8GB" 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 "ZTE Speed (2014) 8GB" has a battery capacity of 2000.0mAh, while the "vivo X21 UD (2018) 128GB" has a 3200.0mAh battery. With regards to battery performance, the "vivo X21 UD (2018) 128GB" has a substantially larger battery capacity than the "ZTE Speed (2014) 8GB", with a difference of 1200mAh. The "vivo X21 UD (2018) 128GB" can be used without charging for a longer time than the "ZTE Speed (2014) 8GB", so it can be used when out and about. If you want a smartphone with a longer-lasting battery, we recommend that you buy the "vivo X21 UD (2018) 128GB" rather than the "ZTE Speed (2014) 8GB".

ScoreBattery capacity
ZTE Speed (2014) 8GB50/1002000.0mAh
vivo X21 UD (2018) 128GB68/1003200.0mAh

Which is better in terms of CPU function, "ZTE Speed (2014) 8GB" 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 "ZTE Speed (2014) 8GB" is equipped with a Qualcomm MSM8916 Snapdragon 410 processor, and its performance speed is 1.2GHz×4(4.0-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). Comparing CPU performance, the "vivo X21 UD (2018) 128GB" has significantly higher specs than the "ZTE Speed (2014) 8GB". The "vivo X21 UD (2018) 128GB" proves to be more advanced than the "ZTE Speed (2014) 8GB" 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 X21 UD (2018) 128GB" rather than the "ZTE Speed (2014) 8GB".

ScoreCPU specs
ZTE Speed (2014) 8GB14/1001.2GHz×4(4.0-cores)
vivo X21 UD (2018) 128GB90/1002.2GHz+1.8GHz×8(8.0-cores)

How is "ZTE Speed (2014) 8GB" 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 "ZTE Speed (2014) 8GB" has 1.0GB of memory. The "vivo X21 UD (2018) 128GB", on the other hand, has 6.0GB. As for memory performance, the "vivo X21 UD (2018) 128GB" has a larger memory capacity than the "ZTE Speed (2014) 8GB", with a difference of about 5GB. The "vivo X21 UD (2018) 128GB" has better multitasking, less crashing, and runs 3D games and VR video better than the "ZTE Speed (2014) 8GB". 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 X21 UD (2018) 128GB" rather than the "ZTE Speed (2014) 8GB".

ScoreRAM size
ZTE Speed (2014) 8GB20/1001.0GB
vivo X21 UD (2018) 128GB90/1006.0GB

Which has a better storage capacity, "ZTE Speed (2014) 8GB" 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 "ZTE Speed (2014) 8GB" has 8.0GB of storage, while the "vivo X21 UD (2018) 128GB" has 128.0GB. In terms of ROM and data storage, the "vivo X21 UD (2018) 128GB" has a much larger capacity than the "ZTE Speed (2014) 8GB", with a difference of about 120GB. The "vivo X21 UD (2018) 128GB" can save more photos and keep more apps installed than the "ZTE Speed (2014) 8GB". If you're searching for a smartphone that can store more data, we recommended that you buy the "vivo X21 UD (2018) 128GB" rather than the "ZTE Speed (2014) 8GB".

ScoreStorage size
ZTE Speed (2014) 8GB24/1008.0GB
vivo X21 UD (2018) 128GB90/100128.0GB

Compare the rear cameras of "ZTE Speed (2014) 8GB" 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 "ZTE Speed (2014) 8GB" has 5.0MP. The "vivo X21 UD (2018) 128GB" has 12.0MP. The rear-facing camera of the "vivo X21 UD (2018) 128GB" also has a higher pixel count than the "ZTE Speed (2014) 8GB", with a difference of about 7MP. The "vivo X21 UD (2018) 128GB" is more capable than the "ZTE Speed (2014) 8GB" 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 X21 UD (2018) 128GB" rather than the "ZTE Speed (2014) 8GB".

ScoreRear-camera resolution
ZTE Speed (2014) 8GB27/1005.0MP
vivo X21 UD (2018) 128GB59/10012.0MP

Which has a front camera with better picture quality, "ZTE Speed (2014) 8GB" 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 "ZTE Speed (2014) 8GB" has a resolution of 2.0MP. The "vivo X21 UD (2018) 128GB"'s has 12.0MP. The front-facing camera of the "vivo X21 UD (2018) 128GB" has a significantly higher number of pixels than the "ZTE Speed (2014) 8GB", with a difference of about 10MP. Therefore, the "vivo X21 UD (2018) 128GB" is more suitable for taking photos and videos than the "ZTE Speed (2014) 8GB". If you want to take and print high-quality selfies, we recommend buying the "vivo X21 UD (2018) 128GB" rather than the "ZTE Speed (2014) 8GB".

ScoreFront-camera resolution
ZTE Speed (2014) 8GB15/1002.0MP
vivo X21 UD (2018) 128GB70/10012.0MP

Compare Performance Specs

ZTE Speed (2014) 8GBvivo X21 UD (2018) 128GB
ImageZTE Speed (2014) 8GBvivo X21 UD (2018) 128GB
MakerZTEvivo
Release date2014-122018-03
ColorBlackBlack/Ruby Red
OSAndroidAndroid
Dimensions (width x height x thickness)66.0mm x 134.6mm x 10.2mm74.8mm x 154.5mm x 7.4mm
Weight136.1g156.2g
Display size4.5inch6.28inch
Display typeTFTSuper AMOLED
Screen resolution (width x height)540 x 9601080 x 2280
Pixel density244ppi401ppi
Battery capacity2000.0mAh3200.0mAh
ChipsetQualcomm MSM8916 Snapdragon 410Qualcomm SDM660 Snapdragon 660
CPU specs1.2GHz×4(4.0-cores)2.2GHz+1.8GHz×8(8.0-cores)
RAM size1.0GB6.0GB
Storage size8.0GB128.0GB
Rear-camera resolution5.0MP12.0MP
Front-camera resolution2.0MP12.0MP

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