Question: why sasuke is stronger than naruto?
Answer: Sasuke doesn't have enough chakra to fight Naruto, and he never did. The first time, he relied on Curse Seal chakra, and the second time, he relied on Tailed Beasts' chakra. ... They were both the strongest alive by the end of the series, with Naruto Uzumaki edging Sasuke Uchiha by a little.