At first glace he is impressive and appealing to the eye. Nice coloring, stocky and sturdy looking. He also looks studdish to me as others have already said. (If when you go to see him and he's not a stallion I'd be wary of the larger crest and somewhat overweightness of him, suggesting founder)
That being said, after a closer look I don't like him as much as I thought I would when he's picked apart.
He's thick in the throat latch which would/may cause difficulty breathing during speed events (like barrels which is what it looks like you do?)
His neck is set on nicely to some pretty good looking shoulders, well sloped. But he has virtually no withers which may cause for saddle fitting issues. He is calf kneed which may develop problems under stress. I do like his pasterns and feet however. Nice, strong looking, short back. He is built down hill. His hip looks like its has a LOT of power to it...but he is also very stood up in the hindend, stilty. And his hocks are way off the ground which wouldn't translate the power of his hip into his work very well.
Unlike the paint I didn't like him as much at first, but I grew to like him more as I went through everything. Grant, it the pictures aren't ideal for a proper confo critic though.
His neck is more attractive to me, I prefer a somewhat longer neck though and his throat latch is refined as opposed to the paint's. His shoulder also appears to be well sloped and he also has some withers to keep that saddle in place! Lol I like his forelegs better as well they appear to be straight from the angles I can see them from, although perhaps a bit tied in at the knee. Also has very nice pasterns, close to ideal well sloped and on the short side of medium length. My only major issue with this one is the long back, which is built downhill as well but less so than the paint. He has a powerful looking hindend, but the catch is I much prefer the angles in his hind legs as opposed to the paints. Yes, his hocks are still fairly high off the ground...but his stifle and hock have a more closed angle to them, which usually translates into better performance.
So, needless to say, I prefer the sorrel (despite the long back) he looks like his limbs would hold up to stress better and likely serve you well performance wise. The paint is very attractive (flashy) and doesn't really have anything majorly wrong with him. In fact, he could prove me wrong and do fantastic things or he might just serve someone nicely as a pleasure/trail horse...but that hind end is just not saying "performance" to me. Either way you're certainly not getting a bad horse conformation wise, so it's your pick really