I say Gaara wins a VERY close battle, because of the Shukaku
i say sandaime but it would be close. Gaara is an excellent shinobi as well but the sandaime kazekage's reputation as the greatest shinobi in the sand is b/c that is what he is.
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Mangas I'm Currently reading :
I take it some people haven't finished reading the manga. *spoilers* Garaa no longer has his bijuu. so having that be a factor is irrelevant.
It would probably be a close battle but can't really say who will win, the kazekage has a upper hand because of the metallic sand or what ever which i think is more deadly but i can't really say who will win.