RHEL7 Desktop or CentOS for VM

Software & Operating Systems Linux
#1

Okay so I am doing Linux Academy course at the moment for LPIC 1, and I want to use a VM so I can have my own server and mess around with the systems, I want to do this outside of their own labs.

Now I know in terms of these two, RHEL7 is at the top of the food chain, it has patches and improvements installed before CentOS has, and at some point I may do a RHEL qualification, so should I purchase a desktop subscription, or just get CentOS?

What extra do I get with RHEL7 over CentOS, in terms of programs that are designed for setups, KVM and docker.

Ideas please 

Thanks!

#2

all you get with rhel7 is updates and that's it. everything else is pretty much the same. without going back and looking at it, i am 99.9999% sure you can get everything done that is needed for rh certifications with centos. as far as VMs go i run both centos7 and 6.5, i mean why not.