So I've heard

[Soulzz]

SM Naruto > or = to Kyuubi True or False

 

[Sanzen]

i would have to say that, that statement is quite false but ok

 

[natssuu]

KM is more powerful than SM, but most of the people prefer Sage mode, including me.

 

[Gildarts Clive]

did you read the manga?, the manga is correct. He defeated the kyuubi with SM, although the kyuubi wasnt at full power, since he was inside the brats body.