I've learned everything I know through my Nan's Arabian Horses. I love the Arabs not only because how majestic and gorgeous they are, but I find they're funny creatures - they act like a wife and a best friend. Not implying other horse aren't same but I find that the Arab horses have more of a spark to them - they almost seem like a human.
Throughbreds. Although some are hot and spook at pretty much everything, they are very athletic, very smart and generally have a good attitude. With patient training I’ve seen them do well in both jumping and dressage.
For me, I have found the OTTB has many issues, not easy to train or take outside. They can wreck themselves and don't do well unless stable pampered! I prefer the Arabian, American Saddler that has not been show trained, Welsh ponies, Nooitgedacht pony, Boerperd, Friesan and Appaloosa. But I think it really depends on the individual you are riding