From everything I've read on MLB, BA, BP, Baseball Analysts and so on, I'd break it down like this
Dominguez
Power - Well Above Avg
Defense - Well Above Avg
Speed - Above Avg
Plate Discipline - Avg (Quite Raw)
Arm - Well Above Avg
Aherns
Power - Above Avg
Defense - Above Avg
Speed - Below Avg
Plate Discipline - Above Avg
Arm - Well Above Avg