It depends what you want it for. The Versa is swim-proof, has onscreen workouts, apps, stores music, makes payments and music control. Also, a colour screen amongst other things.
The Versa retails at £199.99 compared to the Charge 2 at £139.99
In terms of activity tracking, aside from swimming, they do the same thing. The fitbit app is the same.
Mostly it comes down to personal choice.
