I think Race to the Edge is good, and it takes place between the first and second movies, so if you have seen the first, but not the second, watch the TV show first, before watching the second movie! Some references in the show will make more sense in the second movie if you watch the show first!
I have watched that rescue riders show that’s meant for even younger people, and.. It’s alright. Just ok. Not great, not bad. In the middle, tbh.