I prefer to pocket my P11 because it's easier to carry, a little more compact in a pocket, than my M85SSUL. I will carry the 85, though, often, especially if I'm going to be out fishing or something, stainless. I also prefer the power of 9mm over .38 special.
However, when I carry IWB on rare occasion, my 3" M66 Taurus is more compact than my Ruger P90. It is also more powerful. So, I really like carrying the revolver. I prefer revolvers anyway to autos, grew up shooting them, shoot 'em naturally, not that I can't shoot that P90, one of my favs, won a lot of shoots with that thing. But, I'll always revert to .357 and to a K frame sized revolver given the choice in a self defense situation.
I just ordered a JIT belt slide holster for the .357. I'm hoping it'll be near as compact under a loose, long tail shirt as is IWB or at least usable and it should be a lot more comfy, I'm thinkin'. If I like it, I might get one for the P90, too, but the P90's grip doesn't quite carry as stealthy as the revolver.
As to firepower, if I can't end the threat with a couple of .357 magnums, I have a real problem. I've killed 250 lbs boar hog quite dead with .357. I have a lot of confidence in the caliber from hunting experience. Confidence means a lot to me. Either gun is 100 percent reliable, so that has nothing to do with it. When I carry my .357, I normally carry my .38 in strong side front pocket. I carry two speed strips with .38+P as if i were to need them. I have the NY reload if I need it, too, faster than speedloaders. I'm not terribly fast at reloading, auto or revolver. That was one of my weaknesses shooting IDPA. I was accurate and fast, just the reloads were my Achilles heal. I never got any faster than a slow expert because of it. But, I can see few real life scenarios where I'd need more'n a couple of rounds to defend myself.
99 percent of my carry is pocket carry, though, and the KT is more convenient and more powerful than the .38. Firepower, sure, it carries 11 (never got the 12 round mags for it). I guess that's a plus, but it's not the reason I prefer it when carrying pocket only.