When comparing Garmin Vivosmart vs Fitbit Alta, the Slant community recommends Fitbit Alta for most people. In the question“What are the best fitness trackers that pair with iPhones?” Fitbit Alta is ranked 5th while Garmin Vivosmart is ranked 16th. The most important reason people chose Fitbit Alta is:
For its size, the Alta fitness tracker has a large display. The display will show steps, distance, calories burned, active minutes, and sleep time. You can switch between these by tapping the side of the display (there is no button). The screen is easy to read at a glance while on the move except in bright settings.
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 Informative and clear display that's easy to read
For its size, the Alta fitness tracker has a large display. The display will show steps, distance, calories burned, active minutes, and sleep time. You can switch between these by tapping the side of the display (there is no button). The screen is easy to read at a glance while on the move except in bright settings.
Pro Many different wrist band options available to suit your taste
The Alta itself comes in 4 colors: black, teal, purple and plum.
While expensive, you can swap out the band. Classic bands cost $30, leather bands cost $60, and stainless steel bands cost $100.
Pro Reminds you to move every hour
The Alta will remind you about your move alerts each hour. By default, it suggests 250 steps each hour and it will vibrate 10 minutes before each hour is over to give you enough time to accomplish the micro-step goal.
Pro Will fit almost any wrist size
The Alta is available in three different sizes (small, large, and extra large). Each size can be adjusted by a minimum of 1 inch.
This is a great tracker for people with wrists below or above average size who may have trouble finding a comfortable fit with other trackers.
Pro Lightweight and comfortable to wear
As a result of the Alta having a slim design, it is both lightweight and very comfortable to wear.
Pro Week long battery life
The fitness tracker's battery can last a full week before you need to recharge it - quite a bit longer than most activity trackers.
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 Fairly basic features which limits the information you'll receive from the tracker
The Alta fitness tracker is designed to be more of a passive tracker for the Average Joe as opposed to a complete activity tracker for enthusiasts. There is no GPS or heart rate monitor, so the stats you get are limited to steps, rough distance traveled, estimated calories burned, active minutes, and sleep tracking.
Con The device cannot be used without a smartphone or a computer
In order to activate the device for usage, it must be paired with a smartphone and/or a PC (through a USB dongle), and an account must be registered through Fitbit.
Con Difficult to see the display when outdoors
The display is quite dim which makes it very difficult to read when in bright settings.
Con Display is off by default
To manually turn on the display you must double tap the side of the tracker which can be difficult to do properly.
It can also turned on automatically by the appropriate wrist/arm movement for checking the time.
There is no way to keep the display on so it may take some fumbling every time you want to look at the display.
