The ultimate goal is keeping the best performing animal but without a crystal ball I just rely on looks, personality and gut feelings. Something that I'm a sucker for is if there is a pup who seems like he is near the top of the pecking order . . but without being the most aggressive. I think it's a confidence thing and the other pups know it without him having to bite holes in their ears. IMO . . confidence, self esteem, independence . . whatever you call it . . is a big factor in a dog being great versus being a decent representative of his pedigree
X2
If I had to choose at 6-8 weeks old, this would be my pick.