I think the US is markedly better for people in certain professions who want to become rich. This is obviously not true for the general population, but the amount of cash that's chasing profits in tech means that a non-trivial percentage of SF Bay Area techies have a shot at financial independence (let's say, $10M in the bank). This is certainly not true for IT workers in most of the EU.
But if you already have enough to never need to work again, you should be fine in almost any liberal and politically stable country, and there's something to be said about moving to a lower CoL place where you can afford a nicer home, etc.
But if you already have enough to never need to work again, you should be fine in almost any liberal and politically stable country, and there's something to be said about moving to a lower CoL place where you can afford a nicer home, etc.