The Sense is Fitbit's premium fitness and health tracker because it packs the most advanced sensors into a small form factor. The Fitbit Versa looks similar but it lacks a couple of features, such as skin temperature monitoring, ECG, EDA and stress tracking. The Fitbit Charge is an excellent fitness tracker that includes most of the features of the Sense, but it's not a smart watch. In other words, you can't answer phone calls or control smart home accessories with it. On the plus side, the Charge's battery lasts a full day longer and the device costs significantly less than the Sense.