You already have two healers in your party, so I'd recommend taking Nalia over Aerie if you can stand her squeaky voice. In my opinion, Aerie is a good character, but she levels up very slowly because she's multiclassed, and her low hit points can be harassing at times as well (have lots of raise dead memorized if you plan on having Aerie in your team).
Don't worry about Nalia's poor thieving abilities; soon you'll get Imoen, who can find and disarm virtually all traps and pick most locks. Imoen's stealth is her weak point, but your PC is a ranger and will be able to cover this.
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