Personally, I don’t think anyone new to Linux at this point, who isn’t tech-minded, should be pointed to an X11 environment. So until Mint devs have ported Muffin into a Wayland compositor, I wouldn’t recommend it. They’re used to a shiny experience visually, so I’d go with Plasma 6 running on Fedora or OpenSUSE Tumbleweed.

I use a Beelink SER5, but that’s because I also plan to set it up to be a retro game console, in addition to streaming.

Ivan Cukic has ported the Bismuth window decoration to Plasma 6.

https://github.com/ivan-cukic/kwin6-bismuth-decoration