Hi me and my wife currently have a model x and love it so we have decided to get my 17 year old son a Tesla Model S or X for his first car. He is headed off to college next year and we would like to reward him. I am currently debating between a model s or model x. I am planning to custom order and surprise him for his 18th birthday with it in December. We do know that this is a huge gift, but we believe he has earned this, we are using his college money that we had saved because he got a 4 year full ride scholarship to Stanford. Should I get him a model s or x?