Hebi Sasuke is definitely stronger than SM Naruto. His best technique FRS can only be used twice in SM. After that, he's out of SM. FRS is also not a very fast technique. Pein dodged it at nearly point blank range and he did so whilst keeping two other clones at bay. This is how it went down:
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- Notice the distance where he notices it.
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- He stabs each clone whilst dodging.
This happened for Raikage:
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and
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.
If he can do so, then so can Sasuke as Third Raikage is no speed demon like his son, and same goes for Pein. This is manga fact. Sasuke pretty much evaded both Bee and Raikage at a speed above V1 but under V2. FRS is considerably slower. Not to mention in order to call his clones soaking the Sage energy he needs to utilize a scroll.
Anyhow, Madara was able to see KageBushin without EMS, in fact Kage Bushin has never fooled Sharingan. With FRS dodged, what would Naruto do? Maa and Paa are taken out easily with genjutsu or killed outright with Kenjutsu as Sasuke was able to pin down Kabuto's snake effortlessly when he was still in DSM. These toads are not faster or as fast as Kabuto. Naruto can also not fuse with Naruto considering his Kurama chakra.
Naruto can be easily put under genjutsu himself and paralyzed if he comes near. Manda or a Hawk can be summoned to assist. Sasuke wins mid difference max.