Don't know about best but I only have one handgun, a 4" 686-4 that I like a lot. For carry, I like a Bianchi Cyclone holster hung crossdraw. The barrel won't jam into the seat and up into your ribs when you set in a pickup and the grip is always in a handy position. If you are thinking used, I'd try to find a Security 6, they always felt better to me than a GP 100.