In SD what you need is a DA firearm. You likely won't have the time to take the additional step to cock a SA revolver in an emergency. Additionally, as said, a totally enclosed hammer won't allow lint in or catch on a pocket. The function here is to protect your bacon - not to give you a plinker. Buy something far better suited for plinking. Totally different roles.
A 642 or 442 in a pocket holster is a 24/7 CCW. In total boredom Wednesday AM at the range, and out of .357M poppers for my 627 Pro, I took some 125gr JHP poppers out and ran the SPC plates again - five for five and never missed - with my 642. A bit slower to acquire the targets due to the limited sights, but still a great indicator of the J-frame Airweight's capability. I had to clean it anyway, after a few proper SD rounds, so it was no problem there. I kept thinking what a shame it was to clean it after 20 SD rounds, anyway. It's cleaned, loaded, and in my pocket. My vote is for the 642.