For example Red Hat Enterprise Linux or SUSE Enterprise Linux.
I'm considering switching to RHEL, to get a "professional" Linux, since it's free if you register an account, but is it worth it?
Is the experience very different from Fedora?
I manage a number of RHEL/Rocky and Ubuntu machines for work. EL is fine as a server distro but it doesn't make a great desktop distro. The packages are old and I've found it to be missing a number of packages I use on a desktop system. For a desktop, Fedora or Ubuntu is a better fit.