Apple offers an international warranty, but Samsung does not. Xiaomi also provides an international warranty; however, it likely doesn't apply to users living in the U.S. (example). Xiaomi does not currently sell smartphones in the U.S.
While Samsung does not offer an international warranty, it has a stronger global presence. For instance, you might find it easier to locate a Samsung repair store than an Apple repair store.
Global Smartphone Shipments Market Data (Source)
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