Both islands are premier "duty-free" hubs, but St. Maarten is often cited as having a slight edge for "bargain hunters" in 2026 due to the sheer volume of competition and a lack of any sales tax on the Dutch side. St. Thomas (USVI) is the "gold standard" for high-end luxury brands and high-quality craftsmanship, offering a $1,600 duty-free allowance for U.S. citizens (double the usual limit). For the best high-value deal, it is a "pro-move" to comparison shop: St. Maarten is premier for loose diamonds and custom settings, while St. Thomas offers high-quality security and "American-style" consumer protections for major luxury watch and jewelry purchases.