umm... I'm pretty sure that in the manga and the anime, Jiraiya stated that if Naruto didn't have the kyuubi sealed inside of him, he would have at least 4 times more chakra than he has now which is already a LOT given that he can go into sage mode. So without the kyuubi, Naruto basically wouldnt have been hated by his village and be insanely strong and probably be another minato
this is not the case for sasuke, who seems to heavily rely on his sharingan. That is not to say naruto doesnt rely on kyuubi's power, but naruto is known to have a lot of his own chakra and can still learn SM and rasengan.