All of the Labs I've really loved, were Chocolates. That could be a complete coincidence... I dunno. They all happened to be field bred Chocolate Labs, one of which went through advanced Obedience with Gonzo, and we still meet up with her occasionally. She is by far the smartest, sweetest, sharpest Lab I have ever met. Every DA Lab I have met has been Black. A Black Lab attacked Gonzo, when he was just a puppy. Yellow Labs tend to be more mellow, IMO. But I have met plenty of high-strung Yellows, and plenty of sweet Blacks. I think the most important factor is the breeder, the parents/lineage, and the way you raise your dog. You should meet both of the parents, because a lot of your puppy's personality depends on their genetics. The parents should be sound, obedient, friendly, and proven to have hunting ability as well as good conformation and health. If I were buying a Lab puppy, I would be INCREDIBLY picky about the breeder's standards, because health & temperament issues due to backyard breeding (and PMs) is destroying the breed. I would look for a breeder who not only runs extensive health tests on both parents, but who also has proof of health clearances for several generations back, and who has thoroughly researched the lines before breeding.