When comparing Garmin Vivosmart vs Withings Go, the Slant community recommends Withings Go for most people. In the question“What are the best fitness trackers that pair with iPhones?” Withings Go is ranked 11th while Garmin Vivosmart is ranked 16th. The most important reason people chose Withings Go is:
The Withings Go fitness tracker uses an E ink screen, the same as what you would find on an e-reader. Rather than being lit like a usual digital screen, it is much more similar to ink on paper. This makes it very easy to read even in very bright conditions or when in the water.
Specs
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Pros

Pro Smartwatch-like functionality
Vivosmart is capable of showing smartphone notifications and control music playback.
Pro Logs exercise
Pro Week's battery life
Pro Some customization options
Pro Displays time
Pro Good step counter
Pro Very easy to read the display in all lighting conditions
The Withings Go fitness tracker uses an E ink screen, the same as what you would find on an e-reader. Rather than being lit like a usual digital screen, it is much more similar to ink on paper. This makes it very easy to read even in very bright conditions or when in the water.
Pro Water won't cause it any issues
The Withings Go is water-resistant up to 50m. Not only can it easily handle wet weather and sweat, but you can confidently wear it swimming or in the shower.
Pro The display is very simple to use
The display is wonderfully simple so there is 0 time spent on fiddling with settings and figuring out how the display works.
Pressing on the display will switch between the time, and your activity progress.
Pro Can go up to 8 months on a single battery
The Withings Go fitness tracker cannot be recharged, but can last up to 8 months on a single battery.
Cons
Con Companion app is difficult to use
The way the information is presented is confusing and incoherent and there's no logical way to find necessary information.
Con No activity autodetection
Vivosmart does not automatically detect when you start to walk or run, you have to start and stop activity manually.
Con Reps counting feature does not work for some exercises
Reps counting feature is not reliable, sometimes it misses few reps and with some exercises it can count 1 rap, even if you did 10 reps for example. And it can't detect when you start the exercise, so you have to start and stop the counter manually. In practice I frequently forget to start and to stop the counter so after some time I simply sopped using this feature.
Con Difficult to check current time because display most of the time is turned off
In order to turn on the display, for example to see current time, you need to raise you hand and after some delay display some times turns on, sometimes not.
Other option is to double tap the display, which requires both hands.
If you frequently checking current time, it is really annoying.
Con App requires you to provide personal data in order to work
You have to register in the app providing information about your age, gender and weight.
Con App does not work without internet connectivity
It is not possible for example to enter your weight if you are not connected to the internet.
Con No GPS data is collected
Con Very inaccurate sleep tracker
The Withings Go is not a good option for someone wanting accurate data on their sleep habits.
It often doesn't detect times you wake up at all, or sometimes registers them as "light sleep". Many users have reported the number of hours spent sleeping being consistently off by a couple hours or more.
Con Known to underestimate step count
A common complaint is that the Withings Go fitness tracker will underestimate the steps taken. This is the opposite of many trackers which are often known for overestimating the step count.
