As a breeder, I am on the other end of this question. I usually ask clients what they want in a pup, then choose for them.
I have had people come to look at a litter, then take hours to choose a pup. I have had people from far away choose from photos based on what they are looking for in a pup. This is another form of letting the breeder choose for you.
Breeders know their puppies. We live with a litter for 8 weeks and learn what each each puppy is all about.
So pick what you want in a pup, find a breeder, and listen to your breeder.
They won't steer you wrong.