For all you who are saying that Naruto is better than Sasuke in almost every way, you need to examine a few things. This is also for those who say that Sasuke got free op powerups without training.
1. In Sasuke's case, his goal was never to be the greatest ninja like Naruto, and Naruto's other goal was to protect his friends which requires being stronger than friends. Sasuke only tried to obtain power enough for the sole purpose of fulfilling the revenge which Itachi put inside of him, he wanted power to kill itachi. If you remember, Sasuke didn't even want to have the mangekyou sharingan when fighting Itachi, just to show that he could surpass and defeat him without it but later his intentions turned into destroying the leaf for causing his brother, family, him and his clan so much pain and he knew that he needed his brother's eyes for that. For those saying that he got free power from Itachi well he never asked for it (tsukuyomi or whatever) and when the time would have come he would still be at equal or greater footing then Naruto because that is just due to plot and not because he or naruto are better than each other (this isn't real life like Lebron and Kobe).
2. Sasuke was under the influence by the curse mark when he came to Orochimaru which manipulated the mild amount of hatred he had for his brother into greater hatred, and before you say he wasn't a more enlightened ninja like naruto to be able to resist hatred, that is b.s. Naruto would have followed down the same road of darkness if it wasn't for his future experiences like meeting Jiraiya who taught him alot of how to be a better person. If he was in Sasuke's shoes (one who experienced a massacre by the hands of his own brother and told to increase his hatred to gain power) he would have done the same damn thing. So free curse mark power? He only wanted to obtain that power to be strong enough to defeat Itachi FASTER, he wasn't trying hard to be strong he knew Itachi was alive and the curse mark got a hold of him.
3. Sasuke doesn't have sage mode like naruto but if he did he would easily be able to combat Naruto's Toad Sage mode. SM increases abilities, speed, reflexes, and jutsu which would overlap with his current abilities. Snake sage mode would allow Sasuke to perceive every attack that naruto would throw, and the added Snake Sage chakra would give him a great power boost. I think the sharingan would go well with the Snake sage mode because it is very related to the senses and perception, and Snakes are just like that and there cold blooded, so I think that he could be able to hide his chakra and more with Snake sage mode. We all should know that Naruto's speed is due to plot, because his father was fast, if you think about it Jiraiya was slow as hell, and Naruto's speed was much more significant when he had Kyuubi chakra, Toads are slow, snakes are fast if you've ever seen one after their scared. Also Sasuke is only using Juugo's sage power to defeat Obito, and sasuke doesn't have SSM because he doesn't want to be like Orochimaru as Orochi stated some time during the resurrection of the Hokages.
4. Naruto's sage mode is 1 extra power that Sasuke doesn't have but personally I don't see how Naruto with just bijuu is much better than Sasuke. Susanoo is a power that is the ultimate defense and regardless of what you have to say it won't be broken that easily. This whole time naruto has been fighting with other people by his side, and it looks like he has advanced much further but the truth is he just has alot more screen time or page time. Also Sasuke's sharingan allows him to go inside Naruto's mind/soul in which he could probably sever the contact between Naruto and kurama.
Bottom line: Sasuke's goal was never to be the strongest it was to defeat Itachi and that hatred that he gave Sasuke turned him to Orochimaru thru the curse mark. He wasn't trying to use that power to catch up to Naruto, Naruto never did it on his own either, it was the fox's chakra he was using. He can match Naruto's strength, but remember he doesn't have an extra entity with twice the amount of power inside him.
A few things. For the Curse mark, Sasuke did resist it's evilness when Sakura stopped him in the forest of the chunin exam and did it himself while fighting in the preliminary. Sasuke chose to be taken by evil to further his goals, he was all about power at that point and it wasn't only because of Itachi, Kakashi also said it was cause Sasuke witness Naruto's power to grow and felt like he was stay still. Naruto goal was to be stronger than the past Hokages while Sasuke's goal was to e stronger than Itachi to get his revenge.
Actually Sasuke didn't get Itachi's eyes for Konoha, he said he had enough power to attack Konoha after his fight with Bee and didn't want the 8 tails anymore. Sasuke chose to get Itachi's eyes for more power so he can fight Naruto with all he has and because at the time he was about to be blind.
Jiraiya wasn't slow, he was fast enough to out run Pain's summonings while gathering natural energy and attacking the summonings as well. In SM Jiraiya was really fast after turning his feet toad like and bounding off the walls. Sasuke doesn't have DSM because he didn't have any knowledge about it, he learned about it from Kabuto (even Itachi knew of SM) and still didn't quite understand it so Naruto described it for him when it came up on the battle field. Sasuke can't just get DSM, Kabuto stated that power can only be obtain thru training which Sasuke had no time to do.
If Sasuke goes into Naruto's mind then he'll be fighting Kurama and Naruto, also Bee mentioned how he wasn't as strong while in Naruto's Mind so Sasuke would be weaker as while. And Sasuke had Taka, Obito and Zetsu while he fought as well so it's not only Naruto who had people, differences is if Naruto was alone, he'll ultimately will use Kurama's power and defeat whoever while also going out of control if it takes him to 4 tails.
Sasuke pretty much wanted to be the strongest if you think about it, he had a superior complex where Uchihas were above everyone so technically he did wanted to become the strongest since he was 1 of the few Uchihas alive and only knew Itachi was the other Uchiha who he wanted to surpass. He knew Itachi had help in killing the Uchihas but didn't know if it was Uchiha or not since only him and Itachi were said to be alive.
Twice the amount of power? Do you read the manga? Kurama has more than just twice the power of Naruto, he's like 100 fold times stronger. Bijuus are the strongest form of chakra in NV. And Kurama wasn't helping Naruto, he was helping himself, he only allowed Naruto to use his chakra so he could weaken the seal and even then Naruto had to learn to access that power. Jiraiya training was revolved around helping Naruto control Kurama's chakra, he got up to 3 tails and when Jiraiya used the key to slightly open the seal (to go Version 1 4 tails since it's the natural net step), Naruto went Version 2 4 tails which wasn't the plan.
Do I agree with others that Naruto is better than Sasuke in all aspects? No I don't, Sasuke is just as strong or stronger in some skills but Naruto is beyond Sasuke power wise. I would rate their powers from feat and hype as:
SM=/>MS
KM>EMS (only up to Final Susanoo cause he can attack from under Susanoo)
BM>EMS
BSM>>EMS
Sasuke's still can give Naruto a good fight and can even beat him depending on strategies but Naruto power, stamina, and speed are greatly beyond Sasuke's.