First of all you prioritize what you will play mostly, then you add the mood wich think suits better for you.
If you are going to play Lighting/Earth(as a dps) then you will need +ATK mood but dont go for -DEF or -RES because you need them.Like Raikirin mentioned you can get -NIN wich is useless for this characters.
You c*so go to your Character then Details and check what skills use mostly (if it is TAI or NIN) and then decide.