Apple or Garmin

[hennipenni]

Pros and cons of both?
Have a Fitbit at the moment which is ok but is showing it’s age etc. Would like to upgrade but not sure to what?

If you use an iPhone then Apple Watch.

If you are serious about exercise, definitely Garmin. Proper sports watch with settings for all sorts of different sports - running indoor and outdoor, cycling outdoor and stationary, swimming, general cardio, Triathalon, etc (depending on which model you buy, obviously). To get really accurate heart rate monitoring during exercise, buy a chest strap as well.