I didn't like either of them at first, but thank goodness the Splatfests helped flesh out their personalities. I started to prefer Marie because she was more subdued than Callie (in other words, she super chill), and I ended up liking her teams more than most of Callie's. And okay, Marie instantly gained points in my book by being Team Dog.
Doesn't mean I dislike Callie. Marie is just always going to be my favorite because of her composed nature. I almost feel like Callie and Marie have an extrovert VS introvert sort of thing going on, so I naturally came to prefer the quieter one. Both are wonderful characters though, and I love how they balance each other out!