Data!Definitely Worf. He takes no crap from NOONE!Worf. He was always the one who had to save the day in the Empire. He saved Kurn, avenged K'Ehleyr, and defeated Duras. It is because of Worf that Gowron became chancellor of the Empire, and Kahless was restored as Emperor.
WORF!!! Is there any other answer?
Naw...Duras was just having a bad day...