Really any warmblood. But my old mare Lola was a quarter horse and a fantastic show jumper.
Warmbloods, Oldenburgs, thoroughbreds, and Holsteiners are good
Welsh ponys are amazing I have 1 and we do amazing in eq and hunter there great JumpingHorses and eventing
Warm bloods tend to be good jumpers.
Thoroughbred or warmblood
I use a Canadian horse, it has a lot less to do with the breed and a lot more to do with the training you put into the horse and whether or not that specific horse likes/ wants to do the job that you're telling them to do
Any warmblood, but I've known some Thoroughbreds, Arabians, and even Tennessee Walkers to jump as well!