Is Naruto's most proficient move still Shadow Clones?
I think his strongest justu is Sage Art: Super Tailed Beast Rasenshuriken, but his most PROFICIENT jutsu would be multi shadow clone justu simply because it is an extension of his shadow clone jutsu, which is one of the first jutsu he mastered and he has been using it since he was 12 or however old he was when he defended Iruka.