Mithril 2hs vs FBSS/ Investment?

[Broor]

OK Boys I got the job done, FBSS purchased, but now I have need of your collective bro wisdom. We've got an enchanter with 50% haste, which stacks with 21% FBSS, so is it now more effective DPS for our 40 WAR with his damage bonus of five to wield two EBWs at an effective ratio of 7/12 or his axe of the slayers at 23/28? Aggro not much of an issue, thanks again-