We haven't seen that much from Boy Prime that would put him miles ahead of Surfer, sure he has beaten Black Adam, Martian Manhunter, Superboy, the Titans, etc. but Surfer could beat those guys too, probably as easy. Escaping the phantom zone is a good feat, but theres nothing to really compare it to in Marvel so we don't know if Surfer could achieve the same thing. Could Surfer move planets around? Maybe.
We'll see just how tough Superboy Prime is in #7, I suspect Kal-El and Kal-L will kick his ass.