He looks like he is very calm I think dressage but hunter would do too he would look amazing!!! I think whatever you decided to do would be good but dressage is fun! (sometimes
) Plus there is alot to do in dressage but in the mean time if jumping is your thing and since he isnt four yet you could do some things to prepare him for it but i know my 3year old gets bored after sometime because he likes a bit of a challenge!!! BTW he looks AMAZING