Like I said before.

Like I said last time. They would fight over anything and everything.

As I said before they´re a cute pairing and I like them but I think their relationship it´s more based on appearances than the other couples.

I stick to my reason

The other two won't break up.
Rapunzel and Flynn went through incredible growth and personal development together. Flynn was the one who encouraged Rapunzel to value her independence and herself as a person beyond what others could use her for. When Flynn was around Rapunzel, he felt able to let his guard down and didn't feel the need to pretend to be anybody else. Rapunzel provided Flynn with the first person he was able to be completely himself around and felt accepted by. They have an equal partnership, and the whole is greater than the sum of its parts. Together, they are a perfect whole.
Mulan and Shang went through some of the most trying times of their lives together. While they do often disagree, they have been shown to be able to work together despite their differences. I think their differences are part of what make this couple so strong. Mulan needs someone steady to balance her, while Mulan opens Shang's eyes to views he had never considered before and makes him rethink his beliefs and reevaluate what he has trusted blindly for all his life. That's what makes them work. They worked through obstacles (Mulan's reveal, for example) and were there for each other through some of the most difficult times of their lives. I think they were much better than Belle and Beast in terms of a time-developed relationship where both come to slowly be attracted to each other (well, Mulan was superficially attracted to Shang pretty immediately) and develop a long-lasting friendship to create a base for a caring, nurturing relationship that will withstand the issues of time. While they may not have the overwhelming passion of Pocahontas and John, once the infatuation is gone, Mulan and Shang have the much stronger base for a developed, intelligent, accepting relationship that will last for a lifetime.
I personally think Snow White and the Prince are a much more likely love-at-first-sight couple to succeed than Aurora and Phillip, they seem much more organically connected, in my opinion.

^ I agree with you 100%

I can't believe they made it into top 3!

I couldn't agree more with rhythmicmagic :)
Aurora and Philip are only ones out of these which I could somehow imagine to break up, I wonder how they are this far. Just if one takes into account that Philip was first man Aurora ever saw and they didn't have any growing time part like Flynn and Rapunzel.

By now it's a process of elimination.

I see the other two more solid.

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Definitely agree with rhythmicmagic.