Both those horses are bred up the wazoo! The first is double-bred Doc Bar, who does go back to Three Bars. But he is so far back in the lines that I doubt it will have much impact on the foundation percentages.
Different foundation registries have different stringencies for the amount of thoroughbred blood allowed. And there is more than one way to calculate, too, I think.
Once upon a time I had read that a VAST majority of QH in the US will carry a minimum of 70-80% pure QH bloodlines, the rest being TB, or Paint, or Appy, etc. So the registries that require only a 75-80% "purity" are not really accomplishing anything, IMO. I had set a minimum of 90% in my own mind before I calculated percentages for a mare and colt I owned, each calculated out to 96% and 93% respectively.
So unless you are wishing to register in a foundation registry or show for points with that registry I would think that either of those horses is likely a high-quality option for you. Would love to see pics! *drool*