As I understand it, the aluminum bats are more flexible, as it is that flexibility that causes the trampoline effect that propels the baseball further. Furthermore, I'm relatively certain that the weight distribution is comparable, as they have the same center of gravity (I work at sport chalet)
So a friend and I started a debate over dinner, and no-one around here really wants to side with either of us, since neither of us has any concrete facts on the issue. The issue is this: Which would have a greater chance of causing a fatal impact on someone, a wooden bat or an aluminum bat...