Its about who is the better, more knowledgable breeder - this would be quite difficult to decide. You don't want to be supporting a back-yard breeder, but then im sure that back-yard breeders get their pups registered.
I would base my decision on what you see when you go there, what feeling you get from the place.
I wanted a border terrier, we looked at quite a few, all KC registered, not "back-yard" breeders but got the impression that the people, knowledgable as they were, were in it for the money, and it didn't feel right. So i broke every rule in the dog buying book - i answered an add in the local free adds for a border/patterdale (did a quick research on the patts) and went to a family home which had basically put their bitch with the woman's fathers patterdale (im not even sure the bitch was a full BT if im honest) to "let her have a litter". Totally the "wrong" thing. But there were four pups - one had been sold already, the other two, they informed me, they couldn't bear to part with 
They weren't THAT knowledgable but had told me all the advice they were given from their vets etc (i'm ex vet nurse so didn't need advice per se, but it was good to know that they had taken an active inerest) had the puppies first jab done (parvo) and wormed etc. It just FELT right - on paper, totally wrong, but that was 5 years ago and my dog is just lovely, a lovely family pet who i wouldnt change for the world - i still look broodily at the border terriers sometimes, but DDog was The one :)
So what im saying is, on paper, matters not - but go with the person who cares the most, thats what i'd do. To be fair, the woman with 7 out of nine pups left doesn't sound brilliant, my friend bred from her dog for the first time, she had homes for the pups before they were born (some even conceived i think!). Oh and prepare to be questioned, if the breeder doesn't show any concern that you know what you are taking on - YOU DO KNOW SPRINGERS ARE MENTAL DON'T YOU
then id be dubious