I use Fedora on my home computers, and CentOS on my servers. As you can see I love RH based distributions, I guess because it's my first distro (Red Hat 7.3 or 7.2, not sure anymore)
Also Slackware and Gentoo are good.

People that know something about *nix, will know that Kernel is most important thing, other stuff are user preferences.

I forgot to tell, my vote goes to CentOS, because that distro is making me money