I like 9mm and .45 ACP - I personally am not interested in any other calibers (I'll admit, I did have a .380 once, but it was a tiny gun).
I prefer 9mm. All 5 of my guns are 9mm now - I was tired of paying ammo costs for the 45. And, I know others here always tell me to reload, but I don't wnat to reload.
Anyway, ammo technology is better than it was in the 1980s. ANd, if U really want powerful stuff, there are +p and +p+ ammo - I have read that some of the really powerful 9mm ammo can almost touch the power of the 357.
I don't bother to get into caliber arguments w/ people anymore. Some people claim to have the .40 cal flowing thru their veins, and make fun of the 9mm. I just let them. But, I think it comes down to shot placement anyway.