I think this is probably useless information considering that legal restrictions largely limit the ability of people to move from one to the other.

Speaking as an American that “accidentally” moved to the EU a decade ago, my impression is still that ambitious EU citizens, particularly those in tech or finance, would move to the US in a second if it was possible to.

That said, I don’t personally plan on moving back anytime soon, although I do miss certain aspects of the American identity and experience constantly.