This ^ is actually the best answer here.
The deciding factor here is speed. Sasuke's speed is not chakra enhanced, whereas Naruto's is. ie without chakra, Sasuke would end the battle in like 0.005 seconds.
You are wrong. Sasuke uses chakra to enhance his speed (body flicker jutsu) and the sharingan and he still can't blitz Naruto. Naruto has proven he is fast without chakra enhancement.
Naruto proved he was faster than Kakashi when he rescued Sakura -
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A rin/sharingan Sasuke couldn't blitz base Naruto -
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The difference between their speed is Sasuke uses his speed more than Naruto.