i had ankha and traded her for diana -- who is also a super cute snooty -- and whitney is on my wishlist. i liked ankha a lot more than i thought i would and i think she's cuter in game than in pictures but i didn't mind letting her go. the wolves are just so cute and whitney is quite cute in the movie too, yes.
I adore the wolves, Kyle was the first one I've managed to have in my town and he's my favourite villager. I'm just hoping to find Whitney in someone's dream town, and if she's nice I'll probably go for her over Ankha (and have to change my signature as Ankha is listed as a dreamie ._.)
Personally, although I've never had Ankha, I would probably prefer her over Whitney. She is a rather rare villager and it would be a nice surprise to find her in your town! However, Whitney did star in the movie, so that's an upside for her. Plus, she is rather enjoyable. Whichever side you find yourself leaning more towards is probably the right choice.