Which is why Wenger needs to stop being so stubborn and alter his approach. When teams defend with 10 men against utd they get it wide and cross the ball onto Rooneys giant head, when teams attack them they score on the counter. We try and play every game the same way
I think United's style is fairly constant and unchanging. A very agressive press high up the field, coupled with being prepared to leave 2 or 3 men forward at all times.