Board Thread:Theories and Speculation/@comment-33202319-20150622205123/@comment-734582-20150701105928

I just want to point out that Rasengan pretty much has the same weakness as the Chidori (Getting close to people). Naruto substituted the Sharingan for mass clones. Minato substituted clones for Raijin which closes the gap instantly. Rasengan has a greater destructive power (just check the water towers) but Chidori has a much more concentrated power.

It is correct that chidori is purely an assassination technique. Rasengan has a bit more versatility to it, yet is also a more difficult jutsu. All in all, i'd say they're pretty similar.