Ubuntu. Pretty sure you already have an idea why. Lol.
OpenSUSE. I’ve always had issues trying to use it, from zypper to updates to bootloops. It’s also sluggish compared to other distros (yes, same DEs usually) on my laptop. I’ve tried at least 3x trying to get why a lot of people love it. It’s just not for me.
I’ve never tried Manjaro yet, but coming from Arch and EOS I don’t think I ever will.
It’s great. I’m on vanilla Arch now, but EOS would be my first choice if I ever wanted to change to another arch-based distro. The only time I ever encountered any issue (that’s not my fault) was the grub issue last year iirc. Other than that, it’s been pretty smooth. It’s basically Arch with a few QOL features preinstalled.
Edit: just like you, I was on Mint for years before switching to EOS. It’s easy, don’t worry. You’ll want to start reading, though. The wiki and aur are great.
I know people who have and they’re pretty satisfied with their purchases (mostly for audio stuff, though). But I agree i won’t buy something there without reviews.