I’ve been using fedora but I would like to try something new and I think about arch linux but I don’t know if it’s good for gaming. What do you think?
Every distro is going to be good for gaming. Arch is going to be about equal to Fedora when it comes to gaming (both are good).
SteamOS is based on Arch, for instance.
You’re not really going to see a difference when it comes to compatibility or performance, and even if you did, that’s usually just a configuration issue (like setting a large enough VM heap size, which distros are starting to do by default anyway).