The battle of the snooties! JK, I just don't know who to put in my town, I mean I already have Chrissy and it would be great to have a duo but Diana's... different? (lol idk)
In my opinion, I would recommend getting Francine. Since you have Chrissy, then Francine and Chrissy can match. I've had Diana in my main town before, she's nice but she gets a little boring after a while. Then again, it depends what kind of town your aiming for.