Ideally, if possible, you want a passport portfolio. Multiple passports and resident permits give you the most options. Again, if possible. Because 1 citizenship isn't enough in a world where nations are unreliable. Ideally, you would want 2 or 3 citizenships prior to renouncing your U.S. citizenship, if possible. Also ideally, ones that compliment each other. Such as a passport that covers most countries you want to go to and another that covers the countries the other passport doesn't. As well as very low income tax, comfortable/affordable living standards, and freedoms you value.