As i'll start first, i'll consider that Naruto has the advantage of going first...
Ok, let's first clear that Naruto and Sasuke's powers are always very close, but with a slight advantage to Naruto.
why?
Sasuke will have troubles dealing with the great mass of shadow clones Naruto can create [
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] as Kimimaro, who is considered the wielder of one of the greatest Taijutsu abilities, had some troubles dealing with them and it took him quite a long time.
Despite his sharingan's prediction abilities, you can't deny that he will face some serious problems with the clones who can attack him together and completely overwhelm him until he dies.
Sasuke's second problem would be the Kyuubi chakra, we know it increases Naruto's speed capacities and boost his strengh [
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] [
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], and the sharingan wouldn't be enough for Sasuke to dodge 2t Naruto attacks as his bijuu chakra can freely move on it's own, which make it even harder for Sasuke to react. [
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the cloth will also make a good counter for the CM, as both of them provide extra chakra for the user, but the Kyuubi chakra is superior for it's strengh and speed capacitites that grants them to Naruto upon the activation.
I don't have time for links, or anything really. This is a quicky.
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To address what you first said. Naruto and Sasuke's power have never been even remotely close to one another. Rather, I shouldn't say power I should say a combination and balance of the two. If we talk about raw untamed power, Naruto takes this without a doubt. His Kyuubi chakra and natural high reserves of chakra give him much greater potential for higher scaled power techniques. However if we talk about skill Naruto pales in comparison to Sasuke. However the harmony between power and skill is on a higher scale with Sasuke in part 1. Pre Shippuden Sasuke has:
Curse Seal of Heaven
Fully realized Sharingan
Duel elemental manipulation
This is all of his general power. With the curse seal of Heaven, Sasuke has willful manipulation and access to the power. The sealing Kakashi put on Sasuke was only as strong as his will. Take Sasuke's will to surpress the power away and Sasuke can access that power without any limitations. The curse seal grants an unbelievable amount of power and the Curse Seals of Heaven and Earth are noted as Orochimaru's most powerful Juinjutsu. Not only that, but the Juinjutsu grants the the shinobi at the end of the seal the power of the sealer. Meaning, Orochimaru's pseudo-Sage mode power is within Sasuke pre-shippuden.
When I say fully realized Sharingan I mean the average expected level of dojutsu which excludes Mangekyou and Eternal Mangekyou. Copy abilities, perceptional abilities, one of the three great dojutsu is fully realized within Sasuke in pre shippuden. If I recall corretly the Sharingan slows the actions of the aggressor allowing the user to visualize what is happening. That is their perceptual powers allowing them to see in greater detail in a somewhat, slow motion. As the Sharingan develops (one tome, two tome, three tome) the user sees even more. It doesn't matter though, unless the user can keep up with the speed of their opponent. But none the less, it give the user that advantage in perception. Though, Sasuke has always been a natural quick shinobi. He easily mimicked Dancing Leaf after seeing the technique once with Lee and later, had the speed to get through Gaara's defenses which was lee's equivalent without gates and with the leg weights taken off.
Duel elemental manipulation, something attributed to jounin level shinobi. Uchihas with their natural fire affinity was developed within Sasuke at an early age. C-ranked chuunin level techniques were in Sasuke's arsonal before he was even an genin graduate from the academy. Then Sasuke went on to learn a jounin level technique in a month of a completely different element under Kakashi.
That is what we have on Sasuke's power. I won't go into much detail about Naruto's power since we dont' have time for that and Naruto is your argument. I'll give you a base and you expand.
Chakra Reserves
Kyuubi Chakra
Shadow Clones
Uzumaki=insanely high natural reserves, Kyuubi chakra only further enhances that. Kyuubi chakra cna be access to the most rudimentary level at the end of Part 1 but accessed none the less. What this means is a drastic boost in speed and power phsycally and the advantages of healing quickly.
Shadow clones=hundreds.
Power on both sides, Naruto has the advantage but Sasuke is insanely gifted and powerful in his own right, far beyond the scope of most jounin (as is Naruto)
However, now we factor into the equation skill. I'm going to quote the english dub of Sasuke vs. Naruto in the valley of ends for a mere refrance. 0x1000 is still 0 or something like that. What Sasuke was saying, with not skill and just raw power you're much less of a threat. Naruto had learned Rasengan, which is a testiment of skill all in itself, however Sasuke has always trumped Naruto in skill.
Sasuke defeated Naruto effortlessly in taijutsu back in the academy, had natual skills in weaponry, basic shinobi tactics. While naruto froze on his first mission, Sasuke successfuly held his own agaist 2 chuunin level shinobi. When he met with Haku for the second time and actually fought him, Sasuke managed to keep up with his speed for the most part (until he reached the ice mirrors) and he even had strategy to work with as far as tracking his speed. The duel elemental training, we'll go back to that. As I said before, Chuunin level techniques before even being a genin. Then jounin level techniques as a genin. He managed to managed to go toe to toe with Gaara in the chuunin exams from the get go. He took down Temari easily in his pursuit of Gaara. Not only that, but we've seen the feats of Naruto and his clones against Sasuke. Sasuke's wide aray of Fire jutsu allowed him to take out several dozen shadow clones at once. As well, his taijutsu still proved to be at a much higher scale than Naruto's allowing him to make it easy for him.
On a quick tangent, Just how Kakashi took down clones effortlessly in Shippuden when Naruto returned, Sasuke was doing the same exact thing.
Naruto's fighting style until recnet events in shippuden has been head first, power house. He's been using power and bulldozing his way through his enemy trying to overwhelm them
Sasuke's skill is far superior and his level of power grants him the vantage point since it is indeed near the level of power naruto has. Sasuke was more balanced and therefore he was at the vantage point in a fight, not Naruto.
If I remember correctly, once Saske had the Curse seal partially activated, and his Sharingan fully realized, he had no problems keeping up with the speed of Naruto with his base Kyuubi cloak. Since the Curse seal grants enhanced speed and power, just like the Kyuubi cloak, that puts Naruto and Sasuke on equal grounds in the power department when both are active. Add the Sharingan, Sasuke's arsonal of large scale fire techniques, Chidori, innate skill as an Uchiha and prodigy, Sasuke is much more likely a victor than Naruto.
