that is a very good question um let me think does like most best damage.but if a master of uses the lowest card,the chance of it fizzing is about 80%. So chance of casting the spell is 20%. And with spells it does bad damage but you cane of casting it is well 90%. but some spells are really good so i choose fire and BTW i am fire school
In regular questing, storm. But in PvP, fire. It is far easier to stop storm spells with shields than it is to stop fire spells. The automated quest enemies aren't smart enough to take advantage of that, but other players are.
If you're solely interested in instant satisfaction, Storm is your best bet, as Fire spells do a bit less damage and generally do damage over time. However, Diviners (Storm Wizards) have somewhat less health than other Schools, and Storm spells are a bit less accurate. If you pick Storm, I recommend Life as a secondary to keep your health up, and equip gear that boosts your Storm Accuracy and max health.