I would assume the safe bet for best AE rot is Doton > Katon > Kassatsu > Katon.

Another quick question that might be answered quickly or take some more discussion: I have always struggled (and my struggled I mean it takes me more effort than I feel like it should, not that I am failing) with monitoring my buffs and debuffs during a fight with MNK and NIN. Anyone have a screen shot of a UI set up that puts everything in front of your face in a major way? I wish I could just set up my UI so that my buffs and the debuffs I have on the boss are translucent in the middle of the screen, lol.