I'm with macemoneta on this
Originally Posted by smithy2010
..good for a server and Fedora for workstation..
It is essentially irrelevant what would be good to run on a workstation; what is needed in a study for a cert, is something that is as close to exactly the same as the OS on which you are trying to get certified and while Fedora may be more like RH than, say Debian, Centos would be almost identical (as, up to a point, would be Scientific).
You could argue that, say, Bodhi was nice to run on a workstation, but it would be a useless argument because it is just not what you want in this particular situation. Enlightenment, however much you like it or dislike it, is a distraction, and, from the blinkered point-of-view of the certification, the networking is just all fu.
Why would you want an approximate copy, if you could have a near-as exact one? The answer is that you wouldn't, so it has got to be either RH itself or one of the 'exact-copies' (and RH itself is expensive, except for the evaluation versions); no other options needed.