Everytime the two came into contact, there was an equal clash. That being said, if Rasengan>Chidori, than at the times of their clashes, Sasuke>Naruto because his skills were great enough to quell Rasengan with Chidori.
If someone says R>C you're dumb.
If someone says C>R you're dumb.
They are equal:
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If someone says R>C you're dumb.
If someone says C>R you're dumb.
They are equal:
You must be registered for see images
Imagine that with a big ball rasengan (same jutsu just more chakra and wind manipulation) /thread