I would ask the breeder what type of socialization and training they have provided the 7 mo dogs, and go from there.
Honestly, if they haven't tended to the dogs yet as far as those two aspects, if the dogs have been living in a kennel during those critical early months, I would choose a baby puppy, and probably from a different breeder.
My GSD was already 11 months (which I didn't know until much later), when he was seized from his breeder and came to me for foster care. I can't really compare, because I've never raised a puppy (always took in older dogs), but it seems from what I've learned in the forums that those early weeks are crucial. It seems like Jack and I have spent the last two years trying to make up for that lost time.
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