Well that would be subjective though, it heavily depends on the user. Sasuke has demonstrated the ability to use Preta, Deva and Outer Path. Going so far as to greatly out-class Pain in the use of Deva Path when he sealed all the Bijuu as opposed to just failing to seal a single one. "The way it should be used" is also relative to what standard you use. If the standard is Madara then of course he surpasses Sasuke, he became a Juubi Jin. If we are using Pain as the standard then Sasuke has already greatly surpassed him in power.Sasuke didn't/doesn't since he hasn't used the Rinnegan as it should be used