Ubuntu is a noob linux, and I dont see how that and Fedora can be in the top5 since it has so many cycles.
CentOS & ClearOS > all
Stable, Enterprise and long term support.
How about a roundup about BSD OSes?
tell me do you find any irony in your statement. you do know that Fedora is a Red Hat project used as a testing ground for Red Hat releases? and in so much that CentOS is based on Red Hat, Fedora is very important to the existence of CentOS?