They both suck unless you can move faster than the time takes your opponent to see you and throw a kunai/shuriken/fireball at your face, but if I must choose then chidori because it looks cooler and it can kill stuff easier.
if you are talking about kid Kakashi's chidori then ok but if not then what you say makes no sense because they are not stuck in a straight line when doing chidori/rasengan if a kunI,shuriken is thrown they can dodge and still have the jutsu active
That would imply that you could see. Unless the Chidori comes with a free Sharingan, once you use Chidori you're basically blind because of how fast you're moving.
not true cause i have seen Sasuke and Kakashi do it without sharingan active sharingan helps you speed up the training a bit but you can still do it without sharingan and still be able to dodge