Why not try it for yourself on Linux mint first by installing plasma? Plasma 5 is available on mint - I believe Fedora has plasma 6.
I use plasma 6 on my Opensuse Slowroll laptop and plasma 5 on my LMDE desktop.
Overall, I’ve found plasma 6 to run slightly better (I was on plasma 5 on Slowroll too for a long time).
Once you install and try plasma 5 on your current install, that will be a much less disruptive way to see how well it works for you.
After ricing, both plasma 5 and 6 are pretty similar on my setup. The cube desktop effect isn’t there by default on plasma 5 of course.
Linux Mint Debian Edition would be a pretty solid, pre-customized distribution.
I’ve had great experiences with Linux on Lenovo over the years: would be my first recommendation.
I currently use a Dell Inspiron, while it’s works great, I had to do some extra work occasionally. I love that I can get fingerprint login with it on Linux though.