I recently set up Fedora Kinoite on my dad’s laptop for him and he seems very happy with it. Kinoite is the atomic/immutable version with KDE Plasma by default. Once I’d set up a couple of things everything else he needs can be installed with flatpak (just make sure to set Flathub as the default and disable the Fedora flatpaks repo that ships broken packages all the time)
Here’s a wildcard people might not know about: Raspberry Pi Imager
I use it because it’s faster than Etcher and it also has a bunch of quick links to download popular images (mainly for RPI and other arm-based SBCs) in one click which is handy if you use those regularly.