Jenassa, all the way. (The dunmer in Whiterun, who talks about "great art" when you first meet her.)
Though -- minor spoiler warning for random dialog!!! -- she often yells "Nerevar guide me!" which is pretty funny, because I'm using the same character I've started all TES games with, including Morrowind. (KSG the amoral dunmer archer with sociopathic tendencies and a compulsive need to do anything she's asked to. It's a perfectly legitimate role-playing choice.) It's funniest when she's doing the opposite of what I want. I'm just like...no. No, I will not guide you. Have fun doing that.
Anyway, they're not pointless. Once I have all the achievements, and am no longer afraid to use the console to make my maximum encumbrance five digits, THEN they will be pointless.
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May still hire them all just to hear the stuff they say, though.
Lydia is just that stranger who lives in my house.