It depends on what YOU want to do. I'm a western rider and do the games, barrel racing mostly, but I've done a little team penning, heeling, and I'm looking to get into drill team soon enough, so my horse of choice is a flashy quarter horse or paint. Everybody and their mother has a chestnut or sorrel horse, so I honestly try to avoid them. I loved being memorable, and when I unloaded my horses from the trailer and people would say 'Hey, weren't you the one that did this and that last time?'
But of course, I also love the adaptability, speed, intelligence, and strength that seems to be so easy to find in even the quarters and paints without the best bloodlines or the highest pricetag. Some of my best horses were free.