Most of what MCgunner said IS preference, which is important when choosing a firearm for oneself. Nobody should buy a weapon and carry it because someone else says it's better or has this or that. It's merely something you consider while looking at your options. On the other hand, the most limiting factor just so happens to be preference. If you prefer only a select amount of things, you are limited to a certain amount of options, so a person largely has only him/herself to blame if they aren't satisfied.
I have never considered a Ruger P90 a pocket gun, but if that works for you, then so be it. I prefer IWB to pocket carry for most guns except the smallest I'll carry. It's hot here in south Ga, too. This is one reason I like glocks. Ruger's a great, tough gun, but the trigger pull is less than desireable to me and it's bigger and clunkier than most guns I'd conceal. I'd prefer a Sig 239 if going with a single stack. A 1911 would be good too, or even a Sig 220. But that's just me, I'm a fairly sizable fella and have been known to carry and conceal weapons such as the full size HK USP .45 and the Glock 35 .40 cal. The HK wasn't a whole lot of fun, but I was able to conceal it anyway. The glock 35 is lengthy, but pretty slim comparatively. Draw time wasn't too awful, but not as quick as a glock 30, 29, 19, 23, sig 239, 229, etc. Or CZ P01, now that's a nifty 9mm.
As for the 10mm being an outdoor round, the .357 magnum was being carried by law enforcement for a fairly long time. And that meant in or out of patrol cars and buildings. It doesn't bother me at all. But I do think it's not the smartest thing to carry the ball, wadcutter, or hard-cast cartridges available for either round. Those are mostly meant for hunting, so the "outdoor round" argument certainly has some merit (not that I can judge for anyone but myself). I think it's a matter of what kind of bullet you use. But this is certainly not the gospel...