.45 FTW.
BUT, as has been implied, the debate over 9mm being too small and .40 being so much more effective is laughable. Have people become that much harder to kill? 9mm ammo cheaper, more practice, equals more effective weapon.
I got the .45 because after shooting the 9mm, the .40, and then the .45, the .45 felt better, I shot better with it, and the difference between the 9mm and the .45 really IS a big difference in stopping power.
I shot Smith's M&P version of all three calibers, including the Shield in 9mm. The 9mm was fine, the .40 was way snappy, and the .45 was smooth as silk. Shooting them in that order, it's hard to tell, but I'd say the .45 was no more recoil than the 9mm. On paper, the results from the .45 were much better than the .40, and a little better than the 9mm. That's what made my decision.
Whenever the M&P does anything other than go bang when I pull the trigger, I'll look at Glock. Glock certainly has a good rep when it comes to reliablity though, and that's an important feature. Ugly ass guns though. (queue Okie racking the slide... :ducksforcover

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