SM POSITIVES
it's his own power
great reflex
great strength
SM NEGITIVES
limited use
KC POSITIVES
fast
chakra arms
more chakra
evil being sensing
KC NEGITIVES
not his own power
SM for CQC KCM for everything else
It's not his power, but how's that a negative??Fail, the fox isn't naruto's power, no matter how much you say it is or when he had it it will never be "his" power, sasuke on the other hand; the sharangan is his power and he was born with it into his clan from generations and generations he had it since he was 7 years old, he unlocked the first state when he saw itachi in his house standing over his mother and father:
Kurama helps Naruto in battle... It's a team. Two heads are better than one. It'd even free Naruto from genjutsu. And Kurama is smart, apparently.
Besides, Naruto is able to use both at the same time. So he might consider the mode depending on his needs.