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At best, Sasuke might be slightly stronger than Naruto without Kurama. However, in the worst case scenario, he might be substantially weaker than the Seventh Hokage. A fair comparison can only be made once both these characters display their true strength after the loss of Kurama and Rinnegan in the Boruto series.
They are equal in overall power, but their powers are disparate.
Even though Boruto's body isn't fully Otsutsukified, Momoshiki Otsutsuki remains far stronger than Naruto without the aid of Kurama.
Although Naruto usually uses the Six Paths' Sage Mode along with the Kurama Chakra Mode, there is no reason he cannot use it without Kurama's strength. In fact, Naruto can still use the basic Sage Mode, which is enough for him to take down a roster of enemies.
Despite the loss of his dear friend, the Seventh Hokage can still use the Sage Mode. Fans were delighted to see that Naruto still retained some of his powers and that he is capable of taking down strong opponents. However, he had to use Shadow Clones in order to collect the natural energy.
Because Tailed Beasts are life-forms made of pure chakra, they are eventually reborn after dying. They will always come back, but until that happens, they're factually dead. So, deliberately creating some new Tailed-beasts to get Kurama back does not seem like something Naruto would do.
Although Naruto lost Kurama, his Six Paths Powers should still be accessible to him. In Naruto's fight against Madara, he displayed the ability to use Six Paths Sage Mode without tapping into the power of the chakra cloak.
One of the strongest shinobi to have ever existed, Naruto Uzumaki is one of the few characters in the entire series who could possibly defeat Madara Uchiha. During the 4th Great Ninja War, the two clashed for a long time and Naruto was, more or less, able to keep up with him without any significant problems.
Without Kurama, Naruto lost a big part of what defined his strength, and what also made him who he really is.
7 Naruto Vs.
After quite a lot of harsh training, Naruto was able to master Sage Mode. Soon after, he clashed against Pain in Konohagakure and managed to defeat him. At this point in time, Naruto was much stronger than Sasuke who, although had the Mangekyo Sharingan, had no idea about how to use its true powers.
No. Baryon Mode killed him.
After the death of Kurama, he lost the large chakra pool he once had due to the Nine Tail. That played a huge role in performing some of the techniques that demanded a lot of chakra. In conclusion, it is doubtful that he would receive another power-up in the Boruto series.
Being the reincarnation of Asura Otsutsuki, Naruto was offered half the power of the Sage, while Sasuke was given the other half. Upon returning to consciousness, Naruto had gained the incredible ability of the Six Paths Sage Mode.
Essentially, this means that Naruto has an eternity to train and get stronger. In this eternity, Naruto can easily devise ways to take his powers to the next level. He can improve upon his Sage Mode and develop new forms of it, or he can develop new forms of jutsu that would be unique to him.
Naruto and Sasuke are arguably the most powerful characters by the end of the Naruto Shippuden anime, so it goes without saying that Might Guy would stand no chance against Naruto in his Sage of Six Paths mode, or against Sasuke using his Rinnegan.
Itachi would have surpassed Madara Uchiha if things were different for him. He learned every powerful Jutsu at a very young age and had a whole life to hone his skills and strength. However, he died too soon and his true potential never saw the light of day.
Obito absorbs the Ten Tails, becoming its Jinchuriki! He easily shatters the barrier crafted by the Hokage, and even overpowers the legendary shinobi themselves!
Yes, yes he can.
No, sadly, he won't come back. Tailed Beasts are basically made of chakra, so when they're killed, they return to chakra and will be revived soon. However, Baryon mode consumes Kurama's chakra until he die, so there's no chakra left in him, that means he can't be revived anymore.
Shibai Otsutsuki is, by far, the strongest character to ever appear in the story and, for him, dealing with someone as strong as Naruto wouldn't be an issue at all. Even if Naruto had not lost Kurama, his powers would still be inferior to Shibai Otsutsuki.
In a fight against Isshiki Otsutsuki, Kurama sacrifices himself allowing Naruto to enter The Baryon mode. In this, the jinchuriki gains explosive power but it consumes the tailed beast. A new theory suggests that Momoshiki might have enough power to bring back the Nine Tailed Fox.
It turns out the Tailed Beasts never actually die, but they reincarnate over the years. The first instance of a Tailed Beast dying happened with Isobu. The monster was killed alongside his host, and it forced the beast to reform over the years.
Where are all the jinchūriki now? Naruto, Gaara and Bee are the only Jinchuriki alive in Naruto, which makes three Jinchuriki. The rest of them (except two) were captured by the Akatsuki and had their Tailed-Beast extracted from them (killing them in the process).