Which Distro?

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http://www.linuxforums.org – Hi, I want to take LPI exams. i recently used redhat/fedora linux i currently using openSuse Distribution. i want to switch to a linux for professional reasons. which of following distributions is best & suitable for me? and which is most popular than other distributions? (both Desktop & Server) -Debian -SUSE Linux Enterprise (SLES) -Redhat Linux Enterprise (RHEL) -Gentoo Linux -Slackware Linux thanks. (HowTos)