I prefer the 637. The only reason in my opinion to opt for the DAO 642 is if your looking for deep concealment under clothing. I've carried the 637 in a IWB holster and I have not had any issues drawing the pistol and having it snag up on anything. I also prefer the traditional look of the 637 and having the option to shoot in SA. If for home defense I'd opt for the 637 and no issue with lint in my experience. I've heard the 638 w/ the shrouded hammer has had some complaints w/ lint, but I don't know because I've never owned one.