I've noticed that more people seem to prefer the 442 over the 642. Is there a reason for this? I'm surprised really because the stainless finish is more durable for deep concealment. It even seems that the prices for the 442 are actually more than the 642. Is the trigger better on the blued guns or what? I'm asking because I'm going to buy one or the other. Was going to get the 638 for the single action capability but realized that in a defense situation I probably won't have time to cock the hammer for that "precise shot" that they always talk about.