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Originally posted by: Mongoose
In this case I think it's a matter of what you consider "more powerful" to be.

*checks to see we're not in the anime topic*

If it's a matter of sheer destructive power, I think Rasengan wins, because with enough juice you can make a huge ball of chakra, as Naruto demonstrates in the manga. As to which one's a better move to kill someone with... That depends. The Chidori is like a knife; it's highly concentrated, the user runs in at a fast speed, and with the Sharingan, they can theoretically adjust their positioning to counter any evasions the opponent tries. The Rasengan seems to be slower to build up and can be dodged unless the user is fast enough to counter or the chakra ball is just too freakin' big.

I actually like that lets see if I can explain it in a different way. With the Chidori like Mongoose said its a knife or sword, so if you get hit by it in a important area(kidney, stomach) your screwed, but if you dodge it your ok. now with the Rasengan I'm going to relate it to a missile(the kind you put in a bazooka) Its big and packs alot of power and can kill you instantly if it hits you. Now if you dodge it that doesnt mean you cant get hurt by it, you can still be hurt by the force of the blast, which can screw you up in the long run. So all in all the Rasengan is much more dangerous than the Chidori, while the Chidori is extremely leathel if it hits its mark. So all in all if I had to pick one out of the two I would pick the Rasengan over the Chidori