Fitbit devices
PhonesVS currently lists 2 Fitbit devices: 2 in smartwatches. Each page shows the specification sheet, and you can compare any two Fitbit models or put one against a competitor. Recently covered: Fitbit Charge 6, Fitbit Ace LTE.
Smartwatches 2

Fitbit Charge 6
Fitbit's Charge 6 adds Google Maps, Google Wallet, YouTube Music controls, built-in GPS and heart-rate sharing with gym equipment to a tracker rated for up to 7 days of battery; launched at $159.95.

Fitbit Ace LTE
The Fitbit Ace LTE is a kids smartwatch with built-in 4G LTE, GPS, calling and messaging, activity games and 50 m water resistance, priced at $229.95 and needing a Fitbit Ace Pass plan.