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I prefer mabifica a lot more over dipcifica mainly due to what the pines twins would want in a hypothetical relationship with her. Because I don't have too much of a problem with Dipper wanting Pacifica to be selfless, but his appeal in her is purely hinged on her CHANGING herself, while Mabel only wants Pacifica to free herself from the shackles of her trauma.
I feel like Dipper likes Pacifica for what she potentially could be (it's pretty much canon) but Mabel grows to appreciate her for who she is and grows to like her for her, which is a relationship dynamic I enjoy a lot more to be honest.
I know it's very headcanony, but whatever 🤪