I would prefer the chesnut except for those front feet and upright pasterns, not sure if it's how he's standing as his legs just look straight and stiff. But he's got heavier muscle and a bigger hip. They both have a lower hock set than i'd like to see in any horse, but especially for digging in and speed I would think they'd be at a disadvantage. I know you don't want the hock too high for speed but these are awfully low. I will leave that to the barrel experts to chime in, I certainly do not claim to be one. Just things I've noticed from other comments over the years.