The thing that Warbirds does that's neat is that if the wing hits something, it rips off and the crash follows as a result. In AH, the wing clips and you explode. Sure, maybe the crash will have happened anyway, but this way is prettier.
Also, say you're taxiing along at 30 miles per hour and your wing hits a hangar and rips off. In Warbirds, your plane might spin around and come to a stop on the ground. In Aces High, your plane might as well be made of nitroglycerine and you explode.