I think Manny knocks him out in an epic war, and that Pacquiao was far and away the better fighter. I don't think it's a domination by any means, but if someone is getting dominated it's defo Aaron IMO.
Two of Pryor's sloppiest title defenses (Kameda and Hinton) came against southpaws - in both fights, he showed a lot of trouble avoiding his opponent's southpaw left. I know Pryor was a deceiving fighter and he managed to win even when he looked like he should be beaten, but given what we've seen Pac do over the course of his career, I'd still favor him to land shorter, straighter punches inside Pryor's wilder swings and win in the end.
Pryor got touched up by Akio Kameda here and there, but short of that he beat the ever living bejesus outta that poor Jap.