The site picked Gentoo and Slackware for me. I've actually used both. I don't think I'd ever use Gentoo again though, just don't have the time for it. Slackware is my favorite distro. So all in all, pretty good guesswork on the part of whoever made that quiz.
Got me wrong, gave me pcos linux and mandriva, I use fedroa which it gave as an alternate because my preferred GUI is not the default. I use Fedora/Red Hat..
I got the same results and my favorite distros are, in order, Gentoo and Slackware, so it picked me correctly.