For those having trouble, I googled the name of the first link and found this:
Home - Echoing Wind Siberians
Have you googled either of these kennels, to see what people are saying? When I was looking for GSDs, the first kennel I looked at seemed okay, until I googled her - and found a lot of negative stuff. Also, have you been to either place?
Right away I see that your current breeder has only been doing this for 10 years - actually, that's when she got her first one, so she hasn't been breeding that long at all. I don't think that's quite long enough, personally, I've only ever bought dogs from people doing it at least twice that long. She can't possibly have accumulated expert knowledge of the breed, showing experience, titled dogs and a lot of litters in that short of time.
Which pup are you considering from the other breeder? The second littler listed has one male available, his father has never even been shown, so I'd pass over him. The first litter listed comes from better stock, both parents have been shown and have won titles. Only he is OFA certed, and it's concerning that none of the others are, because she says the male came from elsewhere - THAT person OFA'd him, she doesn't seem to have her dogs OFA certed, and I think you need to ask her why.
If it were me, first of all I'd continue shopping around, if you haven't finished already. I looked at dozens and dozens of breeders before I got Rem, it took me a long time. If these two are the only suitable options, I'd go with the impressive breeder. Even if the other breeder is a trainer, the puppies are 8 weeks old - she has not trained them, it'll be up to YOU. So I'd go with the impressive pups. I like that Sulley male.
I have a local friend who breeds Siberians. If you still need help, I can ask him what he thinks, so let me know.