I know it's a bit of an odd question, but I got to thinking today about how different each of these hulk incarnations really was in the film universe and was wondering how a fight would end between the three of them (reasoning that a hulk could knock out another hulk).
2003 Ban Hulk was seen in the film to be massive (20 feet tall) but never seemed to get angry or terribly stronger. He got angry, of course, but never seemed like he was animalistic and even seemed softer and kinder at points.
2008 Norton Hulk was about 9 feet tall and was aggressive and more classically angry, animal-like, and strong (he has no problem ripping off the abominations heads in their fight and only stops because Betty pleads with him). This is also the 0% body fat, super muscular hulk, the uber human.
2012 Ruffalo Hulk: He was seen to be about 9 feet as well, with hulk strength (with a little bit of a belly), but also more in control of his actions and a focused fighter (in the battle of New York at least). While angry, he too never seemed like an uncontrollable animal; he was a strong hulk but also not full of anger and rage.