Pocket carry? Neither. Both are too big for pocket carry in my opinion. Personally, I'd suggest something smaller like the Ruger LCP.
Yes, this. In a De Santis Nemesis holster the LCP is basically the size and thickness of your average wallet. From what I recall comparing them side by side in store the LC9 is about 25% larger than the LCP. I don't see it really being a pocket gun unless you're wearing cargo pants or something with similarly large pockets.