I would take the Thrice Howled Edge, reasoning with all the +% weapon damage buffs on a Conqueror. A Developer once said that with 1% hate a tank can hold 2,5% as much dps if that dps has 0% hate. 82 hate rating is 2,2% hate, which would hold 5,5% more damage. In my simple math that means if Thrice can do 5,5% more damage than the Riddle, thats a winner. Now, I don't have time to do calculations with all the buffs but just with Lumbering, Mettle and Burning Standard, I think there would be more than 5,5% damage output with the Thrice Howled Edge. Could do calculations later when I get home from work.