Alteration, and it's not even close. Charms, lulls, roots, whirls, dots, hastes and slows. Not only is it the most common school we cast, they're the big mana spells, mezzes are cheap in comparison.
Conjuration only makes sense for one situation, keeping multiple mobs locked down for long periods. I'm not saying this never happens, but it is rare, and chances are you'd be lower mana at the start than an alt spec enchanter because they just spent less on the last round of haste and clarity.
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