Face it. Apple's Health app and Apple's Watch totally destroy Fitbit on iOS.
In fact, the Apple Watch pays for itself in about 4 years because one does not have to purchase any $50 a year Fitbit membership.
After 4 years, Apple Watch saves you $50 a year in Fitbit membership fees.
What would you rather wear? Apple Watch or Fitbit on your wrist? Obviously the Apple Watch. Fitbit makes you look like a geek. Apple Watch makes you look cool and stylish.