To me, pedigree is not something to factor into your horse. I know many may disagree with me, and I understand your point of view... but the great genes of relatives may or may not be passed down. I tend to look at the horse itself, rather than what the pedigree predicts.
They are both adorable foals, and the prices are similar.... but looking at pictures of foals and studying their pedigrees does not put me in the right position to measure one over the other. Who do you love? Who do you bond with? Who do you want to raise and take care of and pay for? A horse should be a family member.
But, it all depends on what you want them for. If you want them for breeding, or conformation showing, that's a sort of different story.
To answer your question: in my opinion the dun has a better pedigree. The Zippo in her is pretty nice. The dun probably won't have an as strong/QH'y hind quarter... but it all depends on what you want with them.
Beautiful-- both of them!