I wouldn't fully trust outside box and one because the game engine might not match up your best defender with his best player. It likley will, but funny things do happen.
Personally, I like using a 3-2 defense and I would put your best defender at the same position his star plays. And if that happens to be your best player, an even better move would be to put him at different position offensively and then just match him up defensively. That way he's playing offense against a much weaker player.