https://www.cnet.com/news/fitbit-charge-3-vs-versa-which-is-the-best-fitness-tracker/

Both have touchscreens, although the Charge 3 has a monochrome display compared to the Versa's color LCD. You can swipe across from the sides of the display to access fitness tracking features or settings. To go back, press the side of the Charge 3. The Versa has three physical buttons that let you go back, start or stop activities, and make selections.

You can change the watch faces on both in the Fitbit app. But the Charge 3 has fewer watch faces to choose from than the Versa, which has plenty of third-party options.