Linux - CertificationThis forum is for the discussion of all topics relating to Linux certification.
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I'd suggest CentOS here, as CentOS is a free rebuild of RHEL, thus you should get the same experience with CentOS you'd also get with RHEL.
Fedora is more advanced, as it usually has all the latest stuff, thus you may find other/more/newer config-tools in Fedora which you may not have yet in RHEL/CentOS.