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.
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.