FitBit moved to a subscription model for premium features whereas Garmin is subscription free for everything. If you’re ok with basic features FitBit is fine. The Garmin has way more features than I’d ever use but I do actually use the notification features (saves the extra 0.001 calories burned from taking my phone out my pocket). Useful during meetings where you can more discreetly see whether something needs to be attended to. I use the Garmin during golf to see just how woefully pathetic my drive is (it has downloadable courses and hole tracking). The process is automatic after starting a round and it’s good to see whether I’m improving or not. I think it can also be used for shooting sports too which I need to look at.