Jay,
I have run both Fedora KDE for a while and loved it. I had it installed on a MSI Laptop and it worked really well. I did see the linkfor the Fedora beta come out yesterday and the KDE spin is till available so you should still have support for that for a while. Also as long as there is enough user base I am sure that the KDE version will be around for a while.
I have not used Mageia linus yet, I might have to give that a try. I have tried quite a few distros as I do the Big Daddy Linux distro challenge (although I do not actually participate in the Zoom meeting they have). :)