Last I checked she faced opponents with the same chakra as her, one of them needing two dojutsuSo if Kaguya faced someone as powerful as her with the Sharingan you honestly believe the results would be the same? That's like saying the Sharingan is better than the Byakugan because Rinnegan Sasuke could easily kill Himawari.
Six path senjutsu is six path senjutsu no matter how you look at it, Indra's chakra potency comes from Hagoromo which comes from Kaguya, same level of chakra.