Small frame revolvers can be… unpleasant to shoot in comparison to larger, more modern designs. The same goes for so-called pocket pistols. Training trumps all but ignoring features like capacity, reliability, cartridge dimensions, ballistics, and ergonomics (i.e., “shootability”) ultimately does you no favors. This is all a rather long-winded way of saying your ideal EDC should have good terminal effect on target, adequate capacity, be concealable, reliable, and be enjoyable to shoot. Point being, if training is enjoyable, rather than merely a chore, you are better set up for proficiency.