Some trivia on the subject.
I'm currently doing some research for publication in the next while, with regards to a comparing AH and WB, purely on their approach to the software programming metrics.
Collision Model
WB v2.76 = Collision bubble die or not.
AH v1.02 = Models impacts on various components of plane with resulting damage to any contacted components.
There has been some really interesting and revealing data coming out of this research, that factually answers many questions I've seen here and on AGW or the iEN BBS, about realism, flight models and game play.
Regards,
Badger