No Spotify or Fitbit Pay Fitbit Inspire 2 vs. Fitbit Charge 4: It's the little things that count When choosing between two of the best fitness trackers that are made by the same company, like the Fitbit Inspire 2 and the Fitbit Charge 4, there are bound to be some similarities. These two wearables are more alike than they are different, which may make this decision easy for you. With that in mind, the few differences that you'll find could be the deciding factor. If you want built-in GPS for tracking your route as well as some other bonus features, you'll want to go with the Fitbit Charge 4. If you're happy with the essentials, like activity tracking, heart-rate monitoring, and sleep tracking, you might want to choose the Fitbit Inspire 2 instead.