Some people are just dumb… Yes Sasuke was born gifted with the Uchiha Sharingan, he worked hard to only kill Itachi after that point, I never saw Sasuke training; he kept getting upgrades from Kishi, thanks to Obito he earned MS, and then got Itachi's eyes which automatically gave him EMS, from there onwards Kishi just started giving Sasuke some powers like standing susanoo, another snake summoning, and even Hawk summoning (WTF) and now he got to meet Hagoromo; not because he deserved it, but because he was Indra's incarnate… what a joke!!!
As for Naruto, he was born with nothing, then part of 9 tails got sealed in him which troubled him all his life. He grew up and worked hard to get to Sasuke's level, he worked on his own talent in order not to use the 9 tail's power anymore, worked hard to get the frog senjutsu, and then met Bee who helped him know how to conquer 9 tails but he still had to do the work himself, which put Kurama in such a position that he wanted to corporate.
Even at their young age, Sasuke started using his nature affiliated chakra (lightening Chidori) because he was a genius and had kakashi to teach it to him without much work he could copy it with his eyes. Then as for Naruto, he mastered Rasengan through hard work, which surprised Sasuke at the hospital.
Even their battle at the valley was unfair because Sasuke got "given" the curse mark which boosted his power and allowed him to access Black lightening. Whereas naruto only used Rasengan and level 1 of 9 tail cloak. Kishi wanted Sasuke to win; if not he would have allowed Naruto gain access to more 9 tail power, used his summoning on Sasuke and above all Kishi would have made Naruto use wind from that young age which would have destroyed lightening as lightening is weak against wind.
The most important thing is that since sasuke is Indra's incarnate, he is gifted and didn't have to work much for his powers (which was also stated by Hagoromo; if you read other translations like the one on ***********). As for Ashura, he and his incarnates work hard for their powers as he has a hard work ethic which led him to get closer to his brother.
Now I mentioned that because Kishi used the battle of Naruto Vs. Sasuke at the Valley was used to stimulate the hard work ethic in Naruto that will make him develop his own powers that will equal and surpass Sasuke's which has always been a gift.
IF YOU DONT BELIEVE ME THEN START AGAIN FROM PAGE ONE OF THE NARUTO SERIES WHICH I JUST DID A WEEK AGO AND WATCH EVERY VIDEO AND MOVIE AS WELL