I think the Doctor nailed it. The three biggest advantages of the 9mm are capacity, capacity and size of the guns. Now that you have to pay $50+ for a 15 round mag for that Beretta 92, people tend to just buy the 96 and get 10 rounds of a bigger bullet.
On size, the 9mm can still shine, but even in the smallest autoloaders in this caliber (Glock, Kahr, Kel Tec) you can get the same gun in .40.
The 9mm has less kick, but I don't think that it is really that much less kick. And once you are experienced with handgunning the larger calibers can be controlled just as easily.
And finally for some of us bigger just seems better. It may be psycological, and I can know in my head that a 9mm can do the job just as well as anything else, there is something comforting about having a .45 on my hip.
On size, the 9mm can still shine, but even in the smallest autoloaders in this caliber (Glock, Kahr, Kel Tec) you can get the same gun in .40.
The 9mm has less kick, but I don't think that it is really that much less kick. And once you are experienced with handgunning the larger calibers can be controlled just as easily.
And finally for some of us bigger just seems better. It may be psycological, and I can know in my head that a 9mm can do the job just as well as anything else, there is something comforting about having a .45 on my hip.