I would have to say war is more of an adrenaline rush but the difference is I never knew when it was coming unlike jumping. The saying "war is extremely boring punctuated by moments of sheer terror" always seemed to hold true.
I just got back from Iraq about 3 weeks ago and thanks to a friend I found skydiving. I have made my first two jumps and plan to make my next two next weekend. I'm hooked!!!