I give the edge to Mayweather VS. Alvarez, just because both Bradley fights were VERY competitive/close. Mayweather schooled Alvarez, who has since bounced back to winning, and if he beats Erislandy Lara, then it only cements that win.
Canelo doesn't have the quickness of Bradley nor does Canelo have the ehad movement and defense of Bradley. But then Bradley doesn't have the power of Canelo.
I think it's close. But if you look at it from a stylistic standpoint then I think bradley is a tougher opponent for manny. So I'd give that the edge.
Mayweather's win was a really good performance but the young ginger Mexican is still a bit inexperienced where as Bradley is a vastly experienced word title operater so I'd say PAC's win is the more impressive