I really want to get into Mastodon, but I cannot decide which one I would want to join. Is there one that's say best for.. gaming? Or one best for the arts? I tried to use their search but it's hard to tell which one I'd actually want to be part of.
Part of the fun of Mastodon is opening up the Local feed and seeing what everyone on the instance is talking about even if you don't follow them.
Pick one to be your "primary" where you do your following but don't forget to check up on the exciting things going on with the other instances too.
But really, you can join anywhere, don't think about it too hard. You can always follow anyone from anywhere. I have a very diverse follower/follow list, instance-wise.