one other thing to check before you buy
if you're planning on listing to music/podcasts through bluetooth headphones while you run, and don't want to carry your phone, make sure you'll be able to do what you want
I believe the only streaming service that will let you sync music to the watch is Apple Music.
If you have music files on a hard drive, you can sync those, if they've been synced to your phone first.
apple's podcast app will sync from the phone,
I believe overcast will also.