I've been using Xubuntu for half a decade, zero regrets.
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Linux Mint. Yes, it's not that interesting, but as many others point out, it just works. Both on my laptop and desktop pc. No issues for over two years.
I started with PowerPPC back in the '90s (it did not even ship with a working X system). Then went to Debian a few years later, and it was great. I played around with Gentoo for a little while when it first came out, then ended up back on Debian after a couple months. Then I played around with Arch for a little when it showed up, then went back to Debian. After that I just said fuck it, and have stuck with Debian. I run testing/unstable unless it's some side server I have, in that case I just run stable. I hear good things about OpenSUSE and Fedora, but at this point I'm old and don't feel like trying something when I have no issues. Tiling WM and Vim. That's about all I seem to need.
Q4OS, it's Debian based with KDE, it's beginner friendly. It even has a Windows installer for easy dual boot