Here's my take:
When I started working here in '99, I was issued a S&W 686-5. This is one fantastic .357 revovler, exhibiting excellent balance, a smooth trigger, and good sights. Overall, I couldn't think of anything more I would want in a wheelgun, except for a tritium front sight.
What I soon found out was that I could fire six rounds of .38spl out of this weapon a whole lot faster than I could the more powerful .357mag. After considerable practice, I was able to execute the draw and punch six holes in the -0 center of an IDPA target in well under five seconds. That's not as fast as Miculek, but it ain't bad, either.
Of course, I switched to my Yost 1* 1991 just as soon as I could. It offered me the greater capacity and faster reloads that I felt was a definite downer for the revolver. My speed didn't get any faster with this platform, but I felt more comfortable with it because of the aforementioned pluses.
Then, as time passed, I got to thinking more and more about what makes a great shooter truly great. Never once did the caliber make the difference.
As I took a training class or two, and read countless books on the subject, I came to the conclusion that training, and the ability to put your rounds where you want them, is what makes a great shooter stand out from the rest. Those people that fixate on the size of the bullet, or one platform over another, are generally the more poorly trained of the pistol owners.
At this time, I have switched to carrying a stock CZ 75B in 9mm. With three spare mags on the duty belt, I have 65 rounds of 124g Gold Dots +P ready to go. Do I need that many rounds? Probably not. They are there simply because that's how many mags it took to get spare mags on both sides of the body where they can be utilized regardless of the position I find myself in when any shooting occurs. Again, it's the training that brings these things to light.
Don't like the 9mm? Fine. Be great with your .40 or .45acp or whatever. When your time comes, be ready to perform.