I was more invested in Marquez vs Pacquiao 4 as I'm big fan of Marquez, so for me the excitement of Marquez knocking down Pacquiao for the first time. Then going on to knock out an ATG with one of the most devastating KO's of all time, I was literally shell shocked after and jumping up and down for 5 minutes with excitement. It's probably one of the most shocking/surprising KO's of an ATG in the modern era. Also with the added spice of it being the 4th fight in a rivalry going on for almost 10 years, for me it's clearly Marquez vs Pacquiao 4 from that point of view. Although I wouldn't argue with anyone saying Corrales vs Castillo is better.