> at least you will be able to understand why she has chosen one puppy over another
And do ask your breeder to describe what he/she is seeing at every stage, an experienced breeder will be able to tell you what he/she is looking for in the pups and will be able to articulate precisely what is good in the litter and why some pups might never be show quality. It will be well worth you reading as much as you can about desired conformation in your breed and learn the 'points of a dog' so you can look at the same things your breeder is.
You may find one or other of the pups appeals to you but it would be of great help if the breeder could narrow down the choice for you. Once you've found a breeder you like then perhaps you could spend an afternoon with them talking about the dogs they have/had, looking through photographs, and talking through what they have been aiming for in their breeding.
My breeder is fascinating on this subject and can show me pictures of dogs I admire and discussing what they looked like at 5, 6 and 7 weeks. Some pups, like clothes, don't look like much until they are 'on' - by that I mean that they could be a little unprepossessing whilst mimbling about the whelping pen, but put them in a baby 'stack' or really look at them move and all of a sudden they start to look very impressive indeed. With a little support and coaching from the right breeder I suspect that you will find you
see more than you might imagine you would :) Good luck