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First, all defensive handgun rounds (I'm excluding .44 mag 240gr @1400fps and more powerful cartridges) are under powered; and therefore, you should train to shoot the threat at least twice then assess the situation and take action as warranted. Bullets at handgun velocities do not do the things that bullets at rifle velocities do.
That said, there is little to no significant advantage in one or two more rounds of 9mm v. 40 S&W, one the one hand; and the slightly greater energy of the 40 S&W v. the 9mm.
The primary mechanism of incapacitation of a threat by a handgun bullet is loss of blood pressure caused by bleeding from the damaged tissue the bullet encounters.
Chose the gun and the round that you shoot best, practice correctly and maintain situational awareness.
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NRA Life Member - Orange Gunsite Member - NRA Certified Pistol Instructor
"When plunder becomes a way of life for a group of men living together in society,
they create for themselves in the course of time a legal system that authorizes it and a moral code that justifies it." Frederic Bastiat
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