I have been a fan of the Model 40 and 42 for many years, and I also have a 642 which I like very much. However, I consider a bobbed 37 safer than a 642, because I can press the hammer forward with my thumb while holstering. Obviously, a 642 can be handled safely, also, but not as easily. It may be possible with some holsters to catch the trigger while holstering. The 40 and 42 aren't quite as bad, if you keep your palm off the grip safety.

If you think you might actually want to fire the gun SA, a Bodyguard is a safe choice.