Board Thread:Theories and Speculation/@comment-31966672-20200409171208/@comment-25122992-20200412210600

I meant it as a benefit since Rasengan's lack of speed factor doesn't produce tunnel vision, as in case with Chidori, so you don't need any supplementary methods like a Sharingan to cover that weakness. That's the main difference between Rasengan and Chidori.

While it's true that Chidori can be used without applying speed and by catching someone off guard, it was still created based on this aspect. You have a better chance to catch off guard if you move faster, right? Rasengan cannot do that, and as far as I remember, in anime Jiraya pointed out that the opponent isn't gonna wait to be hit by Rasengan if he sees the attack formed coming.