The "Sport Profile" feature allows you to customize what stats you want to see for each type of exercise. For example, you may want the GPS on for running but not for a circuit workout. These preset profiles save you from having to set up the device each time you exercise.
With the GPS turned on, battery life goes from around 24 days to 9 hours. This is likely fine for people who will always have opportunities to charge it after their run. However for anyone hoping to use the GPS for longer activities, such as hiking, that may not be long enough to be useful.
The Fitbit Surge fitness tracker has automatic, continuous, wrist based heart rate tracking. Heart rate data is stored at one second intervals during exercise, and at five second intervals during non-exercise activities.
It's quite lightweight at 1.6oz and has a large bright display for easy reading while on the move in all types of lighting conditions. It's water resistant up to 50 meters so you're safe to wear it running in all types of weather.
Garmin states the watch has a battery life of 11 hours training and 9 days of use as a watch, which is a fairly short charge compared to other fitness trackers. However many people have found the actual charge to be much less, often needing to be recharged every couple of days.
The Gear Fit2 is one of the few trackers that allows you to store music directly on the device, which means one less electronic you need to carry with you on your workouts. Thanks to the built in GPS and notifications, the Gear Fit2 eliminates the need to bring your smartphone with you on runs.
Not a great option for those who want to use the tracker for long hikes. With the GPS turned on, it goes through battery extremely fast. Only lasting a few hours before needing to be put on power saving mode.