I thought Hiruzen was the best but now i think he was the worse. He may have been the longest, but what did he really accomplish or tried to accomplish? If anything, he is responsible of the Uchiha massacre. I thought he actually tried to negociate to avoid it, but he did nothing. He is also responsible to what happened to Neji's father. Actually, he never tried to avoid death, but use it for his notion of peace. For me he was no different than Danzo. He may have not shown malicious plans or seemed trust worthy because his smile or saying nothing at all, but the simple fact of saying nothing, trying nothing is already a crime for me, maybe even greater than actually talking and give your opinions/act like Danzo does even if they are not always nice to hear