No, they aren't - if billions of people preferred Bach to Beethoven, would it be evidence that Bach is objectively better than Beethoven?
No, because there is no such thing as objectively better when we are discussing opinions.
Facts and opinions are fire and powder - they negate each other. If something is a fact, all opinions about the matter die; if there are opinions about it, it is because there is no fact.
There are no opinions on the matter of whether or not Australia is south of Spain.
There is no fact in the matter of which of them is the superior holiday destination.