Duran is too skilled and versatile for Manny and one of few guys who can get into furious exchanges and get the better of it. Pac's combination of speed, power and ferocity were awesome in the smaller weight divisions but he couldn't fight well going backwards and didn't adapt well when losing. He would try to fight fire with fire as it was the only way he knew how. (and he'd get the worst of it) Oddly I think Pacquiao is more competitive at the higher weights head to head.
Duran at any weight. It's competitive but Duran was too smart and too skilled. I think he stops Pacquiao at 147.