Two of my Doberman pup purchases saw me choosing the pup. The other was chosen for me. No, correction: The second purchase was chosen for me, but I got to meet both pups from the litter – the breeder keeping the other.
My first Dobe, it happened that I got pick of the litter. This was a hobby breeder and I just happened to be one of the first callers. Upon meeting the litter, I chose one of the two largest males, who also were the mellowest. Inexperienced? Yes, I was; but it worked out beautifully for me. His temperament, while plenty active and energetic and a pain like a Doberman, was manageable. He was nice and mellow in the house most of the time. Of course, being mellow in the house most of the time is a Dobe trait in my experience (except when they get an inkling that you might be getting ready to walk them).
My second Dobe, I got to meet both pups. We drove to the breeder's property. They released both pups from inside a building and they came running up to me as I was kneeled down. Like I said, I didn't have a choice between the two pups; but they both acted the same: Literally didn't break stride as they jumped on and started to climb up me and proceeded to bite the top of my head! These were working Dobermans and my boy was quite a machine.
My current Dobe was chosen for me. When I met him at a training field, I knelt down. He, too, didn't break stride as he trotted up to me and proceeded to place his paw on my mouth. Yum. This was indicative of how he does have a very pronounced tendency to put his paws up on everyone and everything.
If you have say in it, I'd like to meet the pups individually first, then together. I personally would be looking for as much confidence as possible. Timidity can be found in this breed, as in many. If you want to test them a little, you can be standing up when you meet them. To take is easier on them, kneel down. I would hope both would act confident. If a pup doesn't come to you right away, it doesn't necessarily mean it's not confident. You need to be able to read dog body language. She might just be less social. Generally, more social is desirable.