Naruto blocked the juubi laser with his tails in BM despite the incredible destructive feats it had.
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As you can see, It made a trench at least 7 mountains thick. It also blasted through 9 TBBs like it was nothing. So imagine how much Naruto can block while in BSM. This can be used to guard his TBBs from Sasuke, enabling him to make huge attacks that Sasuke can't stop. Also, TBBs do not take long to make. Here it's indicated that their speed equals Sasuke's arrows.
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Therefore, rapidly firing them like this.
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means it doesn't take long at all to form them. Kurama also tanked a sage art massive ransengan.
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According to Naruto wiki using the databook as a source, Jiraya's SM massive ransengan can hollow out mountains if it exploded. Naruto's SM is stronger, therefore, his massive ransengan that Kurama tankes was even stronger than Jiraya's. In other words, it was Kirin level, and BSM Naruto can easily tank Kirin.
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Here's some destructive feats Naruto's shown. A barrier blocked a TBB from the juubi. Obito tore it down with chakra arms, but a combined ransengan from BSM Naruto and BM Minato overpowered them, even though they were thicker than the ones used to destroy the barrier. Naruto contributed at least half the power in that attack.
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It also cracked one of Obito's orbs.
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Please bear in mind that 4 of these blocked 4 massive TBBs without a scratch.
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This means that unless the effect of the orbs is exponential, BSM ransengan slightly>1/2 those massive TBBs
The argument "This happened because senjutsu is Obito's weakness" is completely misguided. It forgets why Obito's weak against senjutsu.
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In other words, the juubi's( and by extension Obito's) attacks are senjutsu. To put it simply, if Obito's orbs are weakened by senjutsu, then his own attacks would weaken his orbs, which means that Naruto's BSM ransengan is still>1/2 of those massive TBBs.
PS has a limit of 4 arms. Naruto can fire 5 TBBs rapidly. Therefore, Sasuke may be able to reduce the damage of 4 of them, but 1 full TBB will get through and take its full effect.
In other words, in taijutsu, longe range, and CQB with chakra avatars, Naruto dominates Sasuke. There is no area Sasuke's better at and will inevitably loose to BSM Naruto.