Yoshi P talks about Warriors- from Producer Letter Live @ TGS

[Conna]

I prefer WAR MT and PLD Off tanks on both Ifrit and Garuda. I prefer WAR MT and WAR Off tank for Titan.

The reason is for the two WAR Titan set up: two WARs DPSing the heart make for an almost Guaranteed Shatter. No LB3 required.

Also, a WAR will be able to more easily maintain two DoTs on Titan as well as keep up the Storm's Eye more easily (one less thing I have to do. Storm's Eye does not stack.)

Damage difference between warrior and pld is neglible. The optimal setup is 5 dps sch, whm and a pld. warriors require the slower more risky because longer fights increase chance of error triple heal strat or the warrior will die.