

Mandriva is gone, but there’s a couple of projects carrying its legacy. OpenMandriva is one of them, obviously. Mandrake was my first distro too, so I have a soft spot for it.
From my perspective, OpenMandriva’s biggest strengths are that it’s independent, non-derivative, community driven, and based in Europe. Unfortunately it’s also small, but the people behind it seemingly do a lot with very little, so the community is passionate about the project.
Personally I’m just happy that there are smaller, non-corporate distros still out there providing alternatives. And OMLx seems like a pretty solid distro at that.
For their selling pitch, you can check their FAQ.
Gentoo is great. I used it for a few years 20 years ago and I still think the package manager is the best I’ve ever used. I wouldn’t use Gentoo today, but I’m really glad I went through the install and maintenance process. It didn’t make me a guru, but I did learn a thing or two about Linux.