Skyactive, that was a very good video, although I almost gave up on it early on. Showed pretty convincingly the .40 is a more effective round.
The elephant in the room is the real reason the FBI and police departments are turning in their .40s for 9mm. Although lower cost for weapons (9mm guns last for many more rounds in a lot of the choices) and ammo cost makes a bit of a difference, I suspect the real reason for the switch is the fact that most women do better with the lighter round. And since we are forbidden to suggest there is a difference between the sexes, the change over is attributed to more effective 9mm ammo. This is my opinion only and being a .45 ACP affectionatto I have no dog in the fight.