As far as pocket carry SAFETY, I'd always want either a DAO auto with safety or a snubbie revolver. Or at least a SA you can safely have hammer-down (things with tip-up barrels).
Other things end up in pockets, and can get into the holster as you move around. Coins, especially, can get into it and get wedged into the trigger guard.
IMO, putting a Glock in your pocket is a good way to end up on the evening news...or on Darwin Awards, when the utter lack of a safety - manual, grip or otherwise - lets something else in the pocket cause an ND through your leg. Or ends your ability to reproduce.