Honestly I would probably not purchase either of them, :-\, but since you asked I will elaborate.
The 2nd looks like she is the younger one, and seems to have the more correct foundation (structurally). I can see her turning into one of those very deep bodied wide based cows (for an RA). The 1st heifer looks like she will end up being long and shallow in her heart and rib, and I dont like the way she stands on her back legs.
If you start with a good structure, it is easier to add muscle shape, width, etc to them. If you start with poor structure it can be a mess. Structural correctness is an absolute assett to any herd for longevity and pridictability.
If you have an ok structured cow/heifer and you want to breed her to a bull that you dont know the structure of,....then you dont know what side (the cow or bull) your calf inherrited his aweful structure from. If your cows is structural perfection, then you will know it was the bull that did it.