From the pictures, I like the second one but I wish it didn't have a saddle on. I truely cannot see the feet either. But judging on JUST the pictures, I'd pick the second one, seems to have a decent amount of time on him as well.
I like 2, but to me it looks like he has somewhat small feet and legs while 1 seems to have more substance to his legs and feet. I think 3 could be really pretty with more weight and muscle, but as MudPaint said, the picture isn't the most flattering.