Seriously, tho- WW I and WW II pretty well established that both the .45 and the 9mm Parabellum could be deadly. A lot a variation will exist based on what bullet, and where it hit.
In the meantime, when it is too cold to go shooting, it makes for good argumen... Uh, discussions.
I really don't have a dog in this fight, since I usually carry a .357 mag, which has it's own respectable track record of helping evildoers mend their ways. Personally, I don't want to get shot with ANYTHING, including paint-ball and airsoft.