Kirin requires much longer preparations.
Besides, instant > speed of light.
amaterasu is not instant it must be generated in the eye and then the user must focus on the target and the human eye cannot focus faster then lighting so obviously kirin is faster
there is only two ways this question could be taken
faster as in once its avtivated and starts moving
or
faster as in which one can be used faster
both versions are stupid and here is why one fore time for you
if u mean wich is faster overall including prep time kirin does not even come close it take 3 days to prepare
if u mean once it starts going then kirin because amaterasu was doged by a human being which proves how fast it is not compared to kirin because it is impossible not even minato is faster then lightning the human body cannot move that fast no matter what u do
debate ended unless ppl wanna start crying like lil babies
oh and for those who say amaterasu is instant ur kidding yourself instant stuff cannot be donged it is instant so if it was doged it must not be instant
@rexii the only reason itachi got his suanoo up is cuz he saw it comming b4 it took off its kinda hard not to see a giant lightning dragon in the sky and not realize if i have a strong defense i better activate it