QUOTE(uareader @ Dec 15 2016, 17:45)

I would say Holy > Wind > Ice > Thunder > Dark > Fire based on the status effects, but I didn't think much to get this order.
It's up to debate which is the best defensive proc.
It was briefly discussed
here.
At least it should be Ice > Wind, no idea how Dark and Fire 10% damage reduction fit in (Void never reported back).
For offensive procs Holy > Elec.
But procs are only a part of mage effectiveness.
QUOTE(uareader @ Dec 15 2016, 17:45)

I also like Holy for MP Drain for casual fights where you want to end the battle with full mp without wasting items.
It doesn't really work like that.
MP Drain on normal mobs is the most useless thing ever.
It's pretty good against SGs though.