I compared the Fitbit Charge HR against the comparable Garmin (Vivosmart HR)and Polar (A360) devices. The Fitbit app is head and shoulders better that the others. The Garmin is much easier to use outdoors. The Fitbit is more compact and more comfortable. Neither will connect to a chest strap heart rate sensor, which would provide more reliable data. The Polar will connect to a chest strap sensor but is bigger and bulkier that the others. If outdoors use is not an issue, I would choose the Fitbit. If outdoors use is important the Garmin is a better choice. If really accurate heart rate info is important, probably a different type of device is best for you.