My breeder picked my dog for me because she was a little tyrant and I wanted the craziest female to do schutzhund with. Another family wanted a calmer family dog to dabble in sport with. We both got what we wanted - Versailles is crazy and driven, their dog is more laid back and has much lower energy. I think it's definitely possible for the breeder to know what pup will best match a home.
"In order to really enjoy a dog, one doesn't merely try to train him to be semihuman. The point of it is to open oneself to the possibility of becoming partly a dog." - Edward Hoagland