I developed a proof of concept for a Garmin Watch (I forget which model, this was 6 years ago roughly), and it was interesting, they have their own programming

I developed a proof of concept for a Garmin Watch (I forget which model, this was 6 years ago roughly), and it was interesting, they have their own programming language called MonkeyC, it wasn't complicated to get into, and I had a demo in under a week or two. I based my code off existing sample code, and made it do what was needed for demo purposes. Personally I have owned a Fitbit Ionic, and now an Apple Watch. I'm not sure if I'll ever take the plunge towards a Garmin watch, I mainly enjoy the benefits of the Apple Watch integrating into my iPhone nicely (notifications and GPS nudging come to mind).