I installed Debian + KDE on my mom’s laptop. She hasn’t had a complaint since. How tech-savvy is she, you ask? I’m sitting with her right now, so out of politeness she put on headphones to watch her favorite soap opera. Mind you, the headphones weren’t plugged into the laptop. She was sitting there, headphones on her head, sound coming through the speakers, watching her soaps like this is how it’s meant to be done.
I like the Wayland support from KDE Plasma for things like HDR and Freesync. If you don’t need advanced stuff like that then it’s preference really, Cinnamon would probably be my second choice.