I'm not a breeder, but I heard experienced breeders saying that the best time to select puppies is between they're 5-6 weeks. Not earlier, because they all look like sweet teddies, and not later, because later different parts of their bodies grow at various speed and by the time they're fully matured one can judge only roughly how nice/ugly they'll finally be.
I saw some dogs that looked beautiful and "ready" at the time they were 5-9 months, and then grew up to very average CSVs, often too heavy. On the other hand some later "beauties" and champions looked quite 'starved' and clumsy when growing.
To tell you the truth, I would be really surprised if any knowledgeable breeder advised you which pup you should keep on the basis of just a few bad photos (not even showing properly the proportions/colours of the the pups) and without seeing them live. In my opinion - too great responsibility!
