First of all, Gai's evening elephant is an A-rank jutsu meanwhile the Sixth's Raikiri has a remarkable S-rank according to the Databooks.
Secondly, Gai himself admits Raikiri's superiority when he portrays it as the 1st technique of the Leaf despite him having the evening elephant in his arsenal.
Thirdly, evening elephant
Also, Raikiri can be used more and easier.
Raikiri's only disadvantage is being a close range technique but it can be compensated by mixing raikiri with a kunai so its range will be increased
All in all, raikiri > evening elephant.
Secondly, Gai himself admits Raikiri's superiority when he portrays it as the 1st technique of the Leaf despite him having the evening elephant in his arsenal.
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Thirdly, evening elephant
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meanwhile Raikiri could cut through Kaguya with ease.
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Also, Raikiri can be used more and easier.
Raikiri's only disadvantage is being a close range technique but it can be compensated by mixing raikiri with a kunai so its range will be increased
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All in all, raikiri > evening elephant.
