openSUSE Tumbleweed makes more sense for rolling imo and was even more up-to-date than Arch at times with major DE versions and kernels. And openSUSE like most other mainstream distros doesn't require an encyclopedia to install :p
Fedora is probably the most secure server OS you can get; can't beat SELinux, and nobody else implements it besides Fedora and RHEL.
I personally see no point to Mint since Ubuntu exists, and Mint has had their own share of specific issues one being that Wine didn't work for some months. The rep I got from them in the past was that they mixed their own, Debian, and Ubuntu packages in their default repos that occasionally caused dependency issues. Maybe it's not that bad, but Ubuntu is still around and a lot more supported.
Ubuntu is the distro. It's popular, it looks good (not the boring grey/white Adwaita theme), and can handle multimedia without having to involve any 3rd-party repos. I'd recommend it to beginners today, and I'd probably be using it as a desktop OS still but I like consistency and my home lab is Fedora :p
I have zero interest in Rhino Linux. I don't have issue with Ubuntu's update procedures and trust them to make sure package and distro updates go smoothly for the largest user-base, and I trust openSUSE TW more for rolling since they've been doing it longer. I also don't like the idea of running a fork of a distro that's a fork of another distro :p