Can you revive a sensei because I would want the 4th as my sensei. That would be so awesome because he knew so many jutsu and also the thought of having the best known ninja as your sensei would be so cool. He would be the one I would want to be my sensei.
If I couldn't have him though I would have Kakashi. He knows a lot of jutsu and has a lot of good strategies. It would be cool to work under him. (I would also find a way to get him to take his mask off)