Since Aerie could use both Clerical and Mage spells, I wanted her in my party because that is what I needed. My decision was based on what I wanted to get out of the game, not what I thought you would want me to play. After reading the stat chart on the both of them, I made my choice that Aerie was the better NPC.
Now, how can you argue with that
For every reason you give me that Nalia is better, I can give you one for Aerie.
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Larry, a loyal guardian of the OHF, and devoted member of the Ironworks