I have both the Ruger LCP and the Ruger LCR (357) and interchange which one I carry in my pocket.
They each have their own advantages...
LCR (revolver won't jam, much bigger stopping power)
LCP (lighter, smaller and most concealable)
I end up carrying the LCP more often because it's just easier to carry. If I were going somewhere I thought could be more dangerous or any more potential then I'd upgrade to my 357 LCR (and maybe take my speedloaders too)... I generally wouldn't go to any known dangerous areas though on purpose. In that case that we're not talking everyday conceal and carry, then I'd get out the really big guns. LOL
I'm not interested in carrying what won't fit in my front pocket and the LCR just makes it and I can carry it fine, but it is noticably 25% more bulky and 25% heavier, but still only 1 pound. The LCP is the everyday easy carry though and if I could only have just 1 to carry everyday, I'd choose the smaller LCP. I never even notice it being there even when I'm out for many hours.
I use Remington Golden Sabre 380 ACP ammo for the LCP which has nice adequate stopping power for such a small gun. I use Remington Golden Sabre 357 for the LCR and I like the smaller 125 grain of that ammo because it reduces recoil. Combined with the hogue grip, it works really nice to have managable recoil, but with BIG stopping power.
My wallet is a thin tri-fold, so you see how easy it is to carry the LCP...