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Notice the traits of the Rasengan. Also note that
A) Kabuto partially blocked it
B) Naruto was low on Chakara and injured before he did this.
Yet, it pwnts'd Kabuto 50 feet, leaving a crater in the boulder and a trench in the ground. How can the Chidori compare to the Rasengan when it does this at only half-strength? Also note that Kabuto is completely surrounded in the Rasengans energy bubble. Another advantage the Rasengan has over the Chidori is that it damages you all over your entire body, while the Chidori only damages the immediate point of impact, this why is next to impossible to kill someone with the Chidori, it'll only work if it hits them in a vital spot such as there head or heart, any ware else and the opponent will just keep fighting.
Yung222 can cry as much as he wants that Kabuto summoned something afterwards, but the fact of the matter is that Kabuto didn't immediately get up and sock Naruto in the face, or anybody for that matter. He stumbled home, defeated, like the loser he is. Also, Kabuto has the ability to regenerate, like Naruto, but after getting hit with the Rasengan Kabuto's regen abilities didn't work.