Sorry - not the most exciting topic in the world 
I used a Fitbit for several years but ended up developing an allergy to it. Initially I though it was the rubber strap but after changing the strap to a leather one it became obvious that the back of the Fitbit itself was causing issues for my skin - worsening with each wear.
I really miss the functionality of it though and am considering an Apple Watch. Does anyone have any experience of issues with a Fitbit who has been fine with an Apple Watch? I'm thinking the titanium version should be okay...
All advice welcome 