ruby for me because of her moon rabbit thing and because even though she’s technically more plain-looking, i just think she’s so cute!! bunnie is adorable too though!
Ruby is cute too, but not as iconically “peppy” to me. I think who you prefer depends on whether you want to go with or against expectations. Personally, I enjoy villagers that match their personality aesthetically rather than defy them, but both are valid.
I have Bunnie and really enjoy her! I think they're both pretty cute though so honestly just go with whichever one you prefer or try having both on your island at once and decide that way