I don’t game much but I’d try to stay closer to the debian ecosystem, or one of the more well-known distros. There are a lot of cases where there’s a debian and ubuntu installer for something and otherwise you gotta compile or hope for an appimage or flatpak. Ubuntu’s out because snaps are horrible, although you can get rid of those. Personally I install debian on all my boxes. It’s a really minimal distro and things tend to go pretty fast because of that. Debian or I hear Fedora’s great.