The ladies dont hit the jumps as hard because they weigh less. Its physics. A heavier object will go down the hill faster and off a jump farther. They did not look as comfortable in the air but that is mental kot physical.
There is less of a difference between the men and women in freestyle aerials. My guess is that the gap will start to close when snowboarding passes through its relative infancy and the emphasis on fashion and hanging out is replaced by an emphasis on training and competition, which is where Shawn White really excels.