PE was the NWA before NWA was a thing. And while Dre was a good rapper he's an exponentially better producer than rapper.
I’ve always seen PE as the first pioneer of rap for social causes and for explicit language (can’t think of any other way to describe it except exactly what it was - explicit language labels on music). Remember when you got your age checked to buy an album? PE was like black market music if you were 12 years old lol.
Always have seen Run DMC as the pioneer of pop rap. Maybe the two have eventually converged a bit.