I find I like the deSantis Thumb Break Holster. Positive retention with a tensioner and strap. I am active and I'll not have the weapon bounce out while I'm about. I have the deSantis for all my carry handguns, with the exception of the LCP.

My wife uses a deSantis Pocket holster for her 642. It has alittle hook cut in to help with the draw.