Most of us choose a compact revolver for pocket carry.
For me, a pocket carry gun needs to be about 15 ounces, so it doesn't weigh down jeans or slacks, has to be reliable, and needs to have a heavy trigger pull (at least 8 lbs) no safety. Safeties could get bumped off in a pocket and the confined area and soft holsters means a higher likelihood of accidentally slipping your finger on the trigger when drawn.
The current crop of micro 9mm's has me tempted and most meet my criteria, but generally I'm only going from 7 to 5 rounds, which hasn't convinced me to give up the easy adminstrative handling, safety, reliablity and simple operation of my revolver.
When it comes to a pistol concealed on the belt, then I'm more inclined to go with a compact auto.