The Rinnegan? because he will eventually become the new Sage, and it would be ridiculus if he didn't have the Rinnegan?
The Sharingan? Because he has madly much chakra and he would become extremly overpowered, but not as much as if he would've gotten the Rinnegan.
The Byakuugan? Because that will fit him when he is going to marry Hinata(lol), and it would not give him so much more power, although it fits him, for he is a close-combat type. Byakuugan is ideal for close-range combat.
The Sharingan? Because he has madly much chakra and he would become extremly overpowered, but not as much as if he would've gotten the Rinnegan.
The Byakuugan? Because that will fit him when he is going to marry Hinata(lol), and it would not give him so much more power, although it fits him, for he is a close-combat type. Byakuugan is ideal for close-range combat.