Which of your Earth-countries is the greatest?

A certain set of Americans likes to announce from time to time that theirs’ is the greatest country in the world. Often these people are running for public office, but not always. Regardless, the proclamation is rarely explained, but stated as if it is simply common knowledge and beyond justification. In reality it’s more like a “World’s Best Dad” mug. That shit ain’t been vetted.

But if you did really want to know which was the bestest, how would you determine it? Which do you think it would it be?