I prefer Muffy!! I may not prefer how the sheep look in this game but I still love them more than most other species and I love Muffy. Cherry is cute too though!
I'm saying Muffy even though I have Cherry haha... I love Cherry's design (she's a pink dog with piercings on her ears, I mean...) but sadly we haven't really connected in NH Plus she's one of my starter so her house is terrible, but that doesn't change anything for you haha.
I'm letting her move out when she asks, I think... And I would be super happy with Muffy!
I love sheeps, and I think Muffy looks less "bland" than Cherry (if that makes sense...)
If you're hesitating between the two, don't forget to check their houses too, might help you decide
Ohh my gosh I had to make this exact decision not long ago, I love them both but I chose Cherry because I feel like the tomboyish style of the sisterly personality suits her punk aesthetic more than Muffy’s goth aesthetic