I pocket carry either a G27 .40 (9+1rds) or a SP101 wiley clapp (5rds). I've had my share of small guns, LCP/LCPII, CW380, G42, G43, S&W 642 and all that, but of the truly little guns the easiest to shoot was the G42 .380, it's a little bigger than the LCP series but it's infinitely more shootable as it has usable sights and a good trigger, can't say that about most other tiny 380's. To me, if you're carrying around a J-frame sized gun you can just as easily carry around a G26/G27, which most don't consider to be pocket guns, but I have no issues with it although I do typically wear cargo shorts/pants, so it might not work that well with jeans or dress attire, but I never wear those.
It's always a trade off I guess because usually really small guns aren't that easy to shoot but where they shine is their weight, or their lack thereof. However there are some that are small and shoot well, like the G42 I mentioned above. The LCP conceals better but there's a night and day difference between how well the G42 shoots vs. the LCP. My SP101 is definitely heavier than airweight J-frames but again, shooting it is not an issue, even 357's aren't bad (loud though!) whereas the light J-frames get snappy even with 38 special. So I suppose I'd rather carry around a little more bulk and get a good shooting gun than something really light that just doesn't shoot well. 'You should definitely train with what you actually carry, so it helps to have small, easily shootable carry guns that you can train with, and those usually aren't the smallest and lightest of the bunch.