The Fitbit Charge 4 is a bracelet style activity tracker with built-in GPS. It is arguably the best value for money Fitbit that you can buy right now.

The Polar Unite is essentially a dumbed-down version of the Polar Ignite. It has all of the main features that you would expect from a Polar Sports Watch, except a GPS tracker. While some people might be fine with this setup, runners and cyclists should pay attention.
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https://5krunning.com/polar-unite-vs-fitbit-charge-4-comparison/