I can't speak for mounts, but the GoPro 8 is greatly improved over the previous models.
They made it easy for people who don't want to spend the time editing. You can just plug it into your wall at home and it will automatically upload everything to the cloud. It also makes videos for you that are pretty watchable. We've used that feature a lot when I don't want to deal with editing. You just pick a song and let it do its thing.
Other cool stuff now.... GoPro Plus is like $50 for the year but comes with unlimited cloud storage, a no questions asked warranty if you break the camera, and half-off on all the mounts. I've been on a GoPro strike because the features haven't significantly improved since the 4, but we bought the 8 Black and think it's totally worth it. It has GPS features now as well. Good luck.