This is my first activity tracker, so I haven't experienced any other models or brands. However my thoughts are:
What I like about it: - Super simple to use - Waterproof, very handy - Customizable display - Fitbit pay!!
What I dont like - Battery life, it is advertised as up to 7 days. Mine last max 3 or 4 days. - I can't find many accessories for this model, i.e. nice replacement bands or screen covers - Touch screen isn't very good, sometimes I have to touch it 4 or 5 times before it turns on