BEST LINUX DISTRO???
I think (and I am convinced) that one of the best distros is the one conceived and realized by you. My vote for poll was, however, SuSe, because I know that is a very solid distr. with many enhancements among the others. I currently use a RH 7.2 but it's far away from a mature (or even a 28 yrs. old :-) Linux. Visit http://www.linuxfromscratch.org and let Gerard Beckman (I hope my spell is ok) show you how to build your own distro.
The best would have to be Ubuntu
Ubuntu Rules..Add it to the list if you can