As far as personalities go, I find Nalia far more upsetting than Aerie. Sure, Aerie whines and stutters, but she's been through quite an ordeal. Nalia's personality makes me want to rip my own eyes out so I don't have to read her dialog further. However, Nalia's personality does become much, much better in a certain expansion.
If you already have a PC cleric and Jaheira, I wouldn't worry about including Aerie. If you're only gonna have one magic user, you need someone who can attain a high level and go up levels quickly - this would be Nalia. And as others pointed out, she is more suited for wizardly work in the stats department.
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trux
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