It's actually a dead tie for me. But, since I have Mira in my town, I decided to vote for Mira like the 13 people before me that agreed that Mira is the better Uchi over Cherry.
I like Cherry better. She was my first uchi villager and she's really awesome. I feel like it's almost a cliche to see Mira in a dream town these days.
I like Cherry. I feel people (Like new users to the site) overlook very good villagers and just go with the ones people like, making them more popular.