Debian, openSuSE, Fedora, Rocky, Arch depends what you are using for. One of the first 3 if you're running it on a desktop. Debian if you want the LTS part and the huge amount of packages. Arch if you're feeling more adventurous and don't mind weekly updates. Fedora if you can put up with redhatisms, SuSE otherwise. Rocky if you're running a server and don't want to bother with Debian's config dir OCD or openSuSE's shorter lifecycles.