Sinbad had such a huge buildup as a villian, that it was really hard to predictate. He was written so much better than Madara and his motives as a antagonist, were so much better as well. He's freaking amazing.
Madara was built up similarly, as he had been mentioned and shown all throughout the series. I do agree that Sinbad was written better, though, but there motivations were essentially the same. However, I do prefer him more personally.
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