The GSM standard as run by AT&T is more world compatible. If you get one of AT&T 4G devices and get it unlocked it'll be good for domestic and foreign usage without compromising 4G performance in USA.
Though there's claims of Verizon world phones to my understanding that's Verizon hoping you'd roam abroad which is definitely more expensive than using a local provider Sim on a GSM network abroad.
As you're leaving Sprint should not be difficult to go to AT&T and not Verizon.
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