I’ve been using Debian-based distros most of my adult Linux life, but I read recently that KDE has a better experience on Fedora than Kubuntu, so I want to try it out.
I already know that I won’t be able to use apt, but what other differences should I expect with fedora?
The do not have an LTS release? What is upgrading like? When should you upgrade if you want stability?
It uses DNF which has its own set of features compared to APT. In general I think DNF is much better although it does have more overhead.
You also could look into Fedora Atomic https://fedoraproject.org/atomic-desktops/kinoite/
Atomic desktops use overlays instead of packages which means you get a much cleaner system at the expense of some flexibility.