They are both very cute! I think you should let Rosie go and get Bunnie. If you're getting tired of her, it may be best to just let her leave and see new villagers. Good luck!
Just pick the one you'd have more fun seeing around your town and interacting with. If you think you'll miss Rosie a lot and won't want to cycle through 16 villagers just to get her back, you should keep her (or move out another villager instead). If you've tried to like her but aren't enjoying interacting with her, just get Bunnie!
You can try to visit dream towns that have Bunnie and see what she's like in the game (if you haven't seen her already) to get a better idea of what it will be like to interact with her.
If you don't like her as much anymore, I see no problem in letting her go. I like to experience as many neighbors as I can, and let whomever wants to leave go unless I'm super duper attached to them. If I still like them a little but am okay with them leaving I at least wait until I can get their photo before I let them go, though.
Omg.. Im the same as you. I lost interest in Rosie back then and lately someone let me adopt Bunnie. Im loving bunnie so much more so I guess you should go for a change! I still see Rosie on my main street sometimes
