I've looked over what i know, and i am eliminating bias on this. Normally i would side with Naruto, for anything in any subject. All opinions aside. I feel that Naruto and Sasuke are at close range to each other in strength and jutsu. I have theories to their fight. The main 3 i have a feeling of happening are the following
1) Naruto kills Sasuke when they finally meet.
2) After Tobi is defeated it's just Sasuke in the way, they fight, both of them die. Naruto ends.
3) Sasuke finally has a change of heart and considers coming back with Naruto to team up against Tobi, or at least to get him out the way so they could fight. Sasuke's personality at this point suggests that this may happen. Just to get a final battle with Naruto he will go as far as joining them and maybe Team 7 re-unites to take down Tobi.
I lean more towards theory 3, i'm just getting my hopes up. If it were up to me i'd like it to be so Sasuke just as Itachi gave him his strength and Ocular powers to do the same for Naruto. Sasuke finally grasps what Naruto is after and decides with his last breath to help him. But obvious enough, it's not up to me. But yes at this point they are of close power to eachother.