I will say from a lifetime of exposure to many, many breeds - there are some really good ones. Generally, the larger the horse, as bred for labor and the accompanying personality needed, the more tractable they are. I've been around Clydesdales, Belgian "blues", even a Percheron once. Draught horses are pretty chill - as they need to be, either for the extreme weight of a mounted soldier or toiling away all day pulling heavy shit. Gentle giants.
Being in Texas, we exclusively raised quarterhorses. Can't enough good things about them, but there are lemons on every lot. Generally it's about the amount of time you spend with them. They are also all prey animals and still spook easily.
Thoroughbreds are nuts. The Weimaraner's of the horse world. Big and beautiful, but high-strung and can be a giant PITA. Lived in KY for a few years and spent a decent amount of time around them.
Arabians are scary smart. Bred for endurance. The oldest pure bred line. Showed them as a kid at a place off Slaughter in Austin for 8 years.
Appaloosas are my favorite. Large, but not a draught line, but with their temperament. Won't find a more beautiful breed.
If you want a recreational, functional rider for trips, hunting, etc. Get a mule. I think they can legit read your mind. The whole "stubborn" moniker they have is BS. They are smart, but also have a "feel" for their surroundings, esp danger. In the mountains, snake on the path. Horse might throw you off. A mule will read the room, snake in front, cliff on one side, sheer wall on the other....ergo, fuck that snake and they'll kill it. They get that from the Donkey side of the house - which many know, if you run smaller livestock like sheep/goats, there's usually a donkey out there for predator deterrence.