Now you're waffling. This is nonsense.
If I say Superman IV is an 8/10 that is absolutely arguable. If I say it's my favourite Superman film, I wouldn't expect anyone to have an argument. How could they?
So the score, a number, is arguable but "it's my favourite Superman film", a sorting among a limited selection is not?
You may ask, "Why is it your favourite Superman movie?" and then one can argue about it - or not, that depends on both parties.
That's a discussion, not an argument. If I have a personal preference, you can't argue with me about that. There's no basis for an argument as it's entirely subjective.
Personal preferences can be swayed, they change over a lifetime.
That's not the same thing.