I think it depends on the individual horse. As my first horse, my trainer and I selected an older, been there, done that horse. Silly me, I thought he would be "easy going" at his age (translation: "easy"). Nope. Proving to be pretty stubborn and testing me all of the time. However, I love him already and know I will learn a lot from him.
As has been said, base it on the individual horse and work with a good trainer. You'll be all set