The first one isn't something I would want for speed events. He looks very stiff on his hind. He runs kind of awkwards.
The second horse is well built...ridden by a younger person...but if they are just schooling...whats up with the tie-down? Hmmmm
Love the pally. He is built to run and seems to have a brain on him. I am not criticizing the young girls riding in the video but she really isn't giving him the best opportunity to succeed. He makes a good sharp turn (on a neck rein...not having his face pulled off) and would have been much faster on the run home had she not been confusing him. He didnt know which way to turn, stop or go back.
Theres just something up with the last horse. A nasty expression or something. He just doesn't look pleasant.
If I were buying for my daughter, I would start with the pally. The speed is there, the price is right, he just needs a good rider.