Ask a Magician Thread.

Fire/Poison:
What do you find more useful, Meditation or MP Eater?
I have to choose to only max one, so, which should it be?

Meditation definitely.

From my experience, MP eater is helpful in the pre-misting stages when you're actually hitting till something dies. But after you get your mist to a decent level, all you're doing is running around hitting things only once before you move on to another target where, once again, you hit them once and then move on.

hope that helps.