Zentyal 2 vs ClearOS vs SME Server

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http://serverfault.com – I'm looking for an easy to administer and feature-rich Linux server stack for SMEs. I've found Zentyal 2, ClearOS and SME Server as possible alternatives, and would like to hear your opinion about them. I'm definitely not an experienced Sysadmin, but I'm ready to put a lot of effort in learning the basics. Otherwise, I'm used to Debian based distros (Zentyal2 is such). As I have 3 companies, and they have little bit different needs, I don't like much the all-in-one approach of SME Server, but it seems to be the easies to setup. Do you have any experiences with the above or other systems? Whi (HowTos)