I mean, how am I going to prove two subjective opinions?
That's an unrealistic ask. That's like asking why the 1982 Mets was the best team in history with the world's greatest moustaches. It might be true but any effort to prove it empirically would be an exercise in futility used only to teach someone a point.
If you're trying to have an argument, the smart move would be to find an example of a country where women are both legally and culturally treated as equals and arranged marriage is still something people are happy with.
But I can't exactly prove the Easter bunny didn't his eggs under your pillow unless I can prove it was your sibling messing with you for a prank.