According to Kishi they are equal. Although Naruto was in fact expanding godly amounts of chakra. However Naruto wasn't the only one over exerting himself, the ebtire ninja alliance was just to keep alive. Also Michael did you consider that Naruto actually heals faster thab the average hunan due to being Kurama's jin? Kurama could heal Naruto passively or directly as he fought. So it's understandable how he exoanded godly chakra. Although most of that chakra is due to Kurama, and the other bijuu, of course Naruto has the sage's yang but he still had power from other beings, Naruto's idealism is that he doesn't do major things by himself, that's Sasuke's path. Sasuke exerted godly amounts if chakra as mainting perfect susano requires massive amounts if chakra a bijuu avatar not so much. Also the rinnegan drains on his chakra along with sharingan every drop of chakra matters. Sasuke also has no way to heal himself unlike Naruto's Kurama capabilities. Naruto exerted more chakra than Sasuke is understandable but he can also heal faster combined with bijuu chakra then yes. Sasuke should not, I mean he can but it may be counter productiveas. Conserving chakra was essential. On that note, I find Baruto's willpower is stronger than most. I mean the dude should have been dead so many times but pure willpower keot him going so I think a willpower feat us more impressive than just a chakra pool feat