Please try linux mint, it truly is an exellent and nearly bullet proof OS. Pretty much the most popular distro so theres a good chance if you ever do run into an issue or want to know something its not hard to find the info you need with a simple query. No driver jankiness or hardware support issues ive ever experienced either.
Seconding Linux Mint for transitioning Windows users, especially with the Cinnamon DE. They’ll wonder why they ever hesitated.
I would suggest Fedora KDE spin or Opensuse. Both have KDE as first class citizen.
I mean if their problems were Plasma-specific, it might also be a good idea to try Gnome or something instead.
True but I would go with Mate, Budgie or XFCE because I’m an old fashioned guy :) The new (now it’s old I guess) gnome philosophy hasn’t made a lot of sense to me on a non-touch device.