What horse is better?

First you should get your definition of Horse correct. A horse is and NEVER WAS a PET. A horse is Livestock. A horse is a work animal. The widespread idea that horses can be considered as pets has ruined the breed in general. Today's horses of all breeds are pale shadows of what they were in the early 1900s when my grandad was harvesting wheat in E Oregon USA with 20+ horse teams. If you don't have 8 or 10 hrs of real work for a horse to do daily you have no buisness owning one. If you do have that kind of work for a horse choose the breed best suited to the work. No breed is suitable to be a pet with the possible exception of the miniature breeds.