It's Dotty for me, no question about it.
She's not only my favourite bunny, but my favourite villager overall (alongside Wolfgang, I could never make up my mind between those two lol). I just love her design, the black and white markings are simple and cute, and I love her round eyes. I also really love how they turn red when she's surprised/shocked. I have her on my New Leaf game and it took everything in me to not bring her onto my island in New Horizons. I believe I had her very briefly on my first island, but she was never meant to be a permie and I can't recall anything notable about her stay.
Even though she's not wirh me in NH though, she'll always hold a special place in my heart. I recently picked up NL again though and it's been so nice to see her again.
My least favourite rabbit villager would be Mira... I really don't like her super hero aesthetic, and her colour palette is not my thing at all. Her eyes and mouth/lips are so unsettling to me too.
Like idk why do you even have lips...Sorry to any Mira lovers out there.