"Real" universe as opposed to "alternate" universe. I see Real and Prime as interchangable, since they are both one and the same.
Neither is more real than the other.
Abrams and Paramount call the old continuity "Prime" pretty much to flatter the old fans.
It's simpler and more accurate to call the two versions "old" and "new."
They're not going back to the old. That defeats their purpose in restarting Star Trek.