Definitely Belle or Mulan, I explained it all before

They just wouldn't connect very well IMO.

She would like Ariel's personality, parts of it, but find most of her actions and attitude horrible. She wouldn't dislike Mulan, just not get her or relate to her much.

or Ariel

For the reasons why Snow would not get along with Jasmine. Ariel would be annoyed with her old-fashioned ness and her lack of adventure, while Snow would not like her reckless behaviour

Agreed with all the Ariel vs. Snow comments given that I don't see the two ever getting along: Ariel is too ambiguous, dashing, reckless, daring and rebellious whereas Snow is old fashioned, calculative and has an overly idealized perception of the world hence the thought of a rebellion doesn't even occur her mind prior to the Evil Queen literally attempting on her life. Their outlooks and attitudes wouldn't click well.

I could be wrong...

Snow would like how dreamy Ariel is, but she wouldn't like her additude and actions. Ariel would think Snow is too old-fashioned.