[wslh]

I used to use a FitBit Ionic (GPS enabled watch) and now use a Garmin watch and fortunately it shows a more accurate and better exercise results. In terms of running I saw a difference of ~10-20% in the distance measured in some terrains. I have not precisely compared everything.

BTW the Fitbit Ionic GPS stopped working and now (if it didn't expire) I will go for the health (battery) recall: https://help.fitbit.com/en_US/ionic.htm and give them to another person. This will be the second replacement since this model stopped working after 1 yr of use and Fitbit sent me a new one.