Vivo Y55s (2017) 16GB vs Galaxy S9 SC-02K docomo 64GB

The size of the body has a big influence on the ease of carrying and one-handed operation. The narrower the width, the easier it is to firmly grasp and hold, but you also have to take into account the device's thickness. Also, if the width and height are smaller, its easier to operate one-handed since its easier to extend your fingers. On the contrary, if the width and height are large, it's difficult to fit in your pocket and is bulky even when put in a bag, and portability is impaired.

The "vivo Y55s (2017) 16GB" has a width of 72.9mm, a length of 147.9mm, and a thickness of 7.5mm. Also, the "Galaxy S9 SC-02K docomo 64GB" has a width of 69.0mm, a length of 148.0mm, and a thickness of 8.8mm.

Comparing the width and thickness of the body, there isn't much difference between the "vivo Y55s (2017) 16GB" and "Galaxy S9 SC-02K docomo 64GB" in terms of size. For that reason, the ease of gripping and carrying the devices in one hand is about the same for both. Therefore it's better to compare them in terms of performance and functionality.

Comparing the width and thickness of the body, there isn't a large difference in size between the "vivo Y55s (2017) 16GB" and the "Galaxy S9 SC-02K docomo 64GB". For that reason their one-handed operability, portability, and bulkiness when carried is about the same. That's why I think it's better to compare them in terms of other aspects of performance and functionality.

Comparing the overall size of the two devices, there isn't a big difference in size between the "vivo Y55s (2017) 16GB" and the "Galaxy S9 SC-02K docomo 64GB". For that reason the ease of carrying and use with one hand is about the same for both. That's why it is better to compare the two in terms of other aspects of performance and functionality.

The weight of the device affects hand fatigue and the burden placed upon the wrist. The lighter it is, the longer you'll be able to operate the device without tiring. Also, if the burden placed on the wrist is lower, you'll be able to use the device more comfortably. However if the weight isn't right for you, it could place more of a burden on your body, causing you to feel stress.

The weight of the "vivo Y55s (2017) 16GB" is about 142.0g, and the weight of the "Galaxy S9 SC-02K docomo 64GB" is about 161.0g. Comparing the weight of the two devices, the "vivo Y55s (2017) 16GB" is a lighter smart phone than the "Galaxy S9 SC-02K docomo 64GB", with a difference of about 19g. For that reason the "vivo Y55s (2017) 16GB" is a smart phone that is less likely than the "Galaxy S9 SC-02K docomo 64GB"to put a burden on your fingers and wrist when used for an extended period. That's why we recommend the "vivo Y55s (2017) 16GB" over the "Galaxy S9 SC-02K docomo 64GB".

The size of the screen affects usability and screen visibility. A larger screen means larger letters and buttons on apps, so the user is less likely to tap adjacent buttons by mistake. In addition, the user can enjoy a more intense experience when playing games and watching videos.

The "vivo Y55s (2017) 16GB" has a 5.2inch display. Also, the "Galaxy S9 SC-02K docomo 64GB" has a 5.8inch display. Comparing the screen size, the "Galaxy S9 SC-02K docomo 64GB" has a larger screen compared to the "vivo Y55s (2017) 16GB", with a roughly 0.5inch difference. As a result, the user is less likely to mistap when using apps on the "Galaxy S9 SC-02K docomo 64GB" than on the "vivo Y55s (2017) 16GB", and is also able to enjoy videos and games on a larger screen. Therefore, we recommend the "Galaxy S9 SC-02K docomo 64GB".

Pixel density affects picture quality, and the higher the pixel density, the better the picture quality, which means the user can gain more enjoyment from games and videos. In addition, higher picture quality decreases eyestrain, which means that the user will experience less eye fatigue after prolonged use.

The resolution on the "vivo Y55s (2017) 16GB" is 720 x 1280, and pixel density is 282ppi. Also, the resolution on the "Galaxy S9 SC-02K docomo 64GB" is 1440 x 2960, and pixel density is 567ppi. Comparing the pixel count, the "Galaxy S9 SC-02K docomo 64GB" has much higher pixel density than the "vivo Y55s (2017) 16GB", with a difference of roughly 285ppi. In terms of having better picture quality and exerting less strain on the eyes, the "Galaxy S9 SC-02K docomo 64GB" is superior to the "vivo Y55s (2017) 16GB". If you are looking for a smartphone that is easy on the eyes, displaying texts and pictures clearly without any blurring, we recommend the "Galaxy S9 SC-02K docomo 64GB" over the "vivo Y55s (2017) 16GB".

Battery performance greatly affects battery life, but greater battery capacity does not necessarily mean greater battery life, since battery efficiency should also be considered. Bigger screens and higher CPU performance will mean the batteries are depleted more quickly.

CPU performance affects the ability to process programs, and the ability to process programs is determined by the product of the number of cores in the CPU and the CPU frequency. The higher this performance is, the more smoothly apps and games will run, and with low performance apps and games become heavy and stress is experienced.

The "vivo Y55s (2017) 16GB"'s CPU is a Qualcomm MSM8917 Snapdragon 425, with performance measured at 1.4GHz×4(4.0-cores). Also, the "Galaxy S9 SC-02K docomo 64GB"'s CPU is a Snapdragon 845 SDM845, with performance measured at 2.8GHz×8(8.0-cores). Comparing CPU performance, the "Galaxy S9 SC-02K docomo 64GB" has considerably higher specs than the "vivo Y55s (2017) 16GB". In terms of being able to comfortably play games and run apps smoothly, the "Galaxy S9 SC-02K docomo 64GB" is superior to the "vivo Y55s (2017) 16GB". If you're going for a high spec smart phone that runs smoothly and comfortably handles games, we recommend purchasing the "Galaxy S9 SC-02K docomo 64GB" over the "vivo Y55s (2017) 16GB".

RAM affects multitasking ability and the stability of apps. The larger the amount of RAM is, the more stability there will be even in situations where multiple apps are running simultaneously, allowing for comfortable use. In addition, animation will be more smooth, and apps will be less likely to freeze or crash. Also, without sufficient RAM, there are games you won't be able to run, so it is necessary to be careful.

The weight of the "vivo Y55s (2017) 16GB" is 3.0GB and the weight of the "Galaxy S9 SC-02K docomo 64GB" is 4.0GB. Comparing the devices in terms of RAM, the "Galaxy S9 SC-02K docomo 64GB" has a significantly larger amount of RAM than the "vivo Y55s (2017) 16GB", with a difference of about 1GB. In terms of the unlikeliness of crashing and the ease of multitasking, 3D games and VR, the "Galaxy S9 SC-02K docomo 64GB" is superior to the "vivo Y55s (2017) 16GB". If you're looking for a smart phone that can run multiple apps simultaneously with stability and also allows you to comfortably enjoy 3D games and VR, then we recommend purchasing the "Galaxy S9 SC-02K docomo 64GB" over the "vivo Y55s (2017) 16GB".

Storage capacity affects the amount of data that is capable of being stored. The larger the storage capacity, the more pictures you can take and the more applications you can install. In addition, if your smartphone accepts SD cards, then you can increase its storage capacity. However, there are performance related drawbacks, including a slower data transfer rate than the primary memory, and you cannot transfer all your data on the card, so be warned.

The data storage capacity of the "vivo Y55s (2017) 16GB" is 16.0GB. Also the "Galaxy S9 SC-02K docomo 64GB" is 64.0GB. Regarding storage capacity, the "Galaxy S9 SC-02K docomo 64GB" has a much larger data storage capacity compared to the "vivo Y55s (2017) 16GB", with a roughly 48GB difference. In terms of the number of pictures you can save and the applications that you can install, the "Galaxy S9 SC-02K docomo 64GB" is superior to the "vivo Y55s (2017) 16GB". If you are looking for a smartphone that can save more data, we recommend the "Galaxy S9 SC-02K docomo 64GB" over the "vivo Y55s (2017) 16GB".

One factor that determines the performance of the exterior camera located on the back of the device (the rear/back camera) is the pixel count. The larger the pixel count, the higher the resolution of the pictures you can take, and the cleaner the pictures will look when printed.

"vivo Y55s (2017) 16GB" has a 13.0MP main camera. Also, "Galaxy S9 SC-02K docomo 64GB" has a 12.2MP main camera. Comparing rear camera performance, the "vivo Y55s (2017) 16GB" and "Galaxy S9 SC-02K docomo 64GB" have approximately the same pixel count. As a result, they can both take pictures and shoot videos of roughly the same quality. Therefore, we recommend comparing the two based on other aspects of performance and functionality.

One factor that determines the performance of the exterior camera located on the front of the device (the in/front camera) is the pixel count. The larger the pixel count, the higher the resolution of the pictures you can take, and the cleaner the pictures will look when printed.

"vivo Y55s (2017) 16GB" has an 5.0MP front camera and "Galaxy S9 SC-02K docomo 64GB" has an 8.0MP front camera. Comparing rear camera performance, the front camera of the "Galaxy S9 SC-02K docomo 64GB" has a higher pixel count than the "vivo Y55s (2017) 16GB", with a roughly 3MP difference. As a result, the "Galaxy S9 SC-02K docomo 64GB" is better able to take high quality selfies than the "vivo Y55s (2017) 16GB", and the pictures will look cleaner when printed. Therefore, we recommend the "Galaxy S9 SC-02K docomo 64GB".