You mean in their base forms right ? :y
Pretty sure it's Rasengan, the Rasengan from base Naruto did a lot more than the chidori from base Sasuke in part 1. That's about all I can give you, not sure how it is currently tbh xd
rasengan, it's more concentrated
plus it was already shown to be stronger in part I back on the water tower so i don't see the point in this thread :|