I think getting Moon Scrolls is better than having multiple kind of Tools that you cannot actually use at all .. The drop rate of Red Nature Stone is very awful to the extent that i only saved up 45 friggin pcs of it from the day it was released in the game .. I tried to use it to my Six Paths Necklace and didn't get a match even once .. Plus, the fact that with Moon Scroll, you can buy power-up items in bulk quantities like Cave Keys and others, can automatically outpower what Ninja Tools can give .. Now if the argument falls into the factor of having more tools for leveling up the Tools or for reforging purposes, then the answer is play other TI modes and not the Kage TI ..

(Note : Please, someone correct me if i'm wrong, i haven't tried any other TIs since the update, i only did Kage TI so, let me know if the other TI's rewards was also changed)