Is this even worth a debate? Madara by light years...

This guy was behind everything, and like others already suggested on this thread, he was just a pure badass villain who used people for his own interest, explained his purpose, had a reasonable backstory and achieved what he wanted.
PS: Kaguya is the worst villain imo. Just an asspull to break the sexist criticisms among the fanbase and to add a slightly different flavor to the manga even if it was illogical. She should've just remained a piece of historical abstract. hmm