Fitbit devices are connected to your phone through the Fitbit app, which is more concise and targeted in how it relays all of the essential statistics that you are looking for in one easy-to-read interface. The Fitbit app is also a bit more like other popular apps in terms of social features and a community aspect amongst other Fitbit users, which is something that Garmin tends to move away from in favor of making the device and Garmin Connect tailored 100% to the individual.