Why use a third party fitness app on the Apple Watch?

I’ve been using my Apple Watch very rarely outside of going for walks these days and one of the things I’m asking myself is – should I use a third party fitness app for my walks instead?

I find the built in workouts app to be just fine for my use and reading the privacy policy on apps like Strava where your data is sold I don’t see why anyone would use a third party.

Am I missing something here? Why do you use a third party app?