i like francine a lot better. i've never been a fan of the big sparkly eyes that animals like chrissy and cookie have. i do still like chrissy though, and i love seeing the two of them together in a town.
I like Chrissy just a bit more, but they're both like in my top 10. If Francine wasn't so expensive to adopt or buy the amiibo card of I would have her in my town too, I already have Chrissy.
I like Francine more! Both look nice, but I have a sentimental attachment to Francine while I've never had Chrissy before. I think they're fine without being in the same town; I don't mind having Francine without Chrissy.
Francine! she has a snooty aura about her that I really like. I like Chrissy too, but if I had to choose one I prefer, i'd say Francine because Chrissy is a little too cutesy for me. I still like her though. Although I definitely prefer Chrissy's house over Francine's, but I can see where the inspiration for their houses comes from.
Personally, I don't think there can't be one without the other since everyone has their preferences. But for science, maybe one day i'll have them both in a town together.