It's really surprising to me that everyone cares about this topic to the extent that they do.

EDIT- That said, the first one is by far the prettiest.

And I believe it's safe to say that us here at datarealms believe MARPAT to be loads better than ACU. This debate is far from over though, right?

camo is just a base, it should NEVER just be worn like that, one of the main principles of war is to conceal your outline/shadow (i.e always walk below the horizon)- if you saw this shadow you could tell it was human http://www.defensetech.org/images/M4-web.jpg if you saw the ghillie (because I couldn't find an example of a man covered with branches grass on top of his camouflage) if diffuses the shadow in with the background, however it is not possible in a desert environment etc.