[Users] ovirt vs RHEV-M

I see you have instructions for building the ovirt manager up on the wiki. My question is: How does this compare to what Red Hat is shipping in RHEL? Is the code base currently the same as what Red Hat is shipping? I am evaluating ovirt for possible deployment in a university setting and wondering if it would be better to pursue a RHEL subscription for our cluster. Any light you could shed on this would be very helpful. Thanks, Gary