Best to max out fireball first or fire mastery?

Lyndis

Diabloii.Net Member
Best to max out fireball first or fire mastery?

My meteorb sorc has already maxed out FO and Meteor, and has put 4 points in both cold and fire mastery. Should I continue pumping Fire mastery at this point or max out fireball first, which has 12 points?
 
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