I've been trying to sort this out and I've gotten stuck (the school year is starting soon and the college is beginning to harass me for financial aid and forms they say I never signed that they really just pulled out of their ass) The difference between these two forms of Naruto is the difference between regular Sage Mode 50% kurama and SPSM kurama. Both of these Narutos had rikudo chakra and the passive boost that allows, so I need to figure out exactly what SPSM is worth to compare it to 50% kurama using normal Sage Mode, because we have a good amount of info on SM+BM from when Naruto used it in the war. The reason I'm having trouble with SPSM is because, when Naruto gained that form, he gained two power ups at once. He gained rikudo chakra and SPSM at the same time. Looking at the boost to Sasuke's base stats, we can see that the chakra given to each of them by Hagoromo was a substantial boost by itself, but now I haven't been able to think of a way to isolate the boost from Hagoromo chakra from the boost of the enhanced sage mode. Even though the databook shows an image of cloaked Naruto in the entry for SPSM, I don't think the chakra cloak Naruto has is from SPSM itself. That doesn't really make sense. It would make more sense if that cloak is just an enhanced Kurama Mode - Bijuu Mode cloak. That explains why it transforms into an avatar of kurama. All things considered, the question is whether it is better to gain SPSM or to gain 50% of kurama's chakra with Sage Mode infused. I'm not sure if SPSM can be quantified by comparing SPSM Naruto and cloaked SPSM Naruto to RG Sasuke, but I'm getting tired thinking about it so I'm outsourcing the work. Also, does anyone have a copy of where The Last guidebook says Naruto was only using BM+SM to fight Toneri?