Which option would be better towards my damage?

On regular mobs, it depends on how much w.att and %str you already have on the rest of your gear.
On bosses, obviously the Empress set is better.

Well my main is already 200 so I guess the regular mobs part isn't very useful.
% str wise I currently have.. 49ish%, although as the weeks roll by I'll be cubing my gear for 12% str (aside from my weapon and dragon emblem of course)