I hate sounding like a broken record.

Naruto has no freakin' chance to win against Sasuke right now, and if he did, it would be completely against the backbone of the story.

Naruto winning the final fight through the powers of unknown gifts from strangers? well, excuse me if I think that makes for a shitty story-telling.

Naruto, so far, has only KB and Rasengan to call as respectfully gained abilities, Kyuubi is either too maverick to control, or too weak to make a difference. Sage techniques weren't revealed yet, and he didn't even work hard to get them (he had the nerve to suggest taking the oil with him, so he wouldn't need to master the skill to use it). Itachi's gift and whatever 'light key' the frog is holding are gifts from someone else.
Sasuke, master of taijutsu, chidori, fire jutsu (tons of jutsus he got from Orochimaru, after defeating him in his own court), Sharingan (maybe even forms of super sharingan), and perhaps the 8-tails (he beat the previous host, so he earned it).

the fight will go something like this:
Sasuke: I've gave up on everything I held dear to, I've come to peace with the history of my family, with my brother and with my desire for revenge, I've been to depths of hell and arisen back.
Naruto: That's pretty cool, I've been wasting time in the village, never embarking away on my own, but a lot of people granted me magical powers that activate despite my will. Sasuke: so basically, you got a shitload of HP, and triggered control attacks from people who created them in order for you to kill me? that's kinda cheating, isn't it?
Naruto: yes, it's like everything I've done in the story is moot, since I'll fight you with tools I was practically given by others.

^I'll be back to that in a minute^

Madare is a much bigger villain than Payne. he's older, more sinister, has the most awesome bloodline in the universe (as far as we know, Sharingan is better than Rinngan. and it'll take a lot of creative thinking to get me believe otherwise), and acts like the boss of payne. plus, Payne's weakness (secret) is known to the good guys, but when Itachi used his last breath to attack Madare through Sasuke, Madare brushed it off and said he has more secrets.
Payne, on the other hand, was already 1/6th killed. and seems to be in constant need of medical attention from the freezetubes.

Madare is a much bigger villain.

*back to Naruto and Sasuke*
Sasuke, as said by others, has much more known and influencal buffs. a better track record of 'clean winnings' and all around victories and generally more deserves to win.

like I've said in almost every other 'Naruto is stupid' topic, we need Sasuke out of the story for a few months, and Naruto needs to get a clean, fair training arc, and not just two pages in the background of something bigger happening. not to mention Naruto needs to score a victory against someone who matters, the last time he won was against Kazuko. and that's with 5 friends ganging up, and Kakashi still did most of the work. pathetic.