well...
90 bich/light/ice & 30 fire
Pros:
-Shield buff (phy def)
-KD and Stabs (will safe you in many times)
-Mana Shield
-Better in pvp & jobs
Cons:
-Lack in damage because light as imbue (just a little difference)
-Not as good in PvE (but anyways it's nice)
90 ice/light/fire & 30 bicheon
Pros:
-Higher damage dealer (with fire as imbue)
-Can use all the nukes (which is very fun)
-Better in PvE
-Mana shield too
Cons:
-Lack of phy def
-Would be easyly killed in pvp & job
-won't have KD neithr stabs (which could keep you alive)
Up to you... If you don't pvp too much and wanna have fun go 90 ice/light/fire & 30 bicheon