While I agree that most distros look the same, installation tools, package management and community support will drive a person to one or the other. For me, Kubuntu is the stuff.
I started out in 2002 with Suse, and loved how different it was from Microsoft Windows. However, I had some quibbles with their implementation of KDE, and when Novell was threatening to buy it, I jumped ship and landed on Gentoo. Used it for a couple of years, learned a LOT about Linux under the hood, but got discouraged with the slow updates. An update to Amarok would be released, for instance, and right away there'd be packages for RPM and APT, but the Gentoo repos were always behind. Packages seem to remain 'untested' for a long time after users of other distros got to enjoy the benefits of the update, but as a Gentoo user, I had to wait. And then doing the "config-make-make install" rumba became tedious for me.
So now it's Kubuntu. Installation is a snap, so's adding packages. And everything, for the most part, just works. Every release seems to be a marked improvement over the last. Even Wine works now! I've been very pleased with how well put together it is, and that we get to rely on Debian's repository is a plus.
Having said all that, it's just my opinion. I don't mean to start a flame war with my criticisms of Gentoo. It was a great learning experience, and I owe what I know about Linux to having to format and partition my hard drives from scratch, and having to compile the kernel and everything else. But nowadays, it's just not my bag, baby. My hat's off to the hard-core tinkerers who enjoy rolling their own with Gentoo, Ark, et al.
The best thing has to be that there's something out there for just about anyone who wants to dive into this giant pool called Linux. And I hope it stays that way.
In retrospect, everything is funny.
-- Unknown