Why not get the Unlocked version for the US? You get Samsung Pay with that and a slew of compatible networks. Trust me, Samsung Pay IS worth it.
Samsung gives the U.S. the perfect Galaxy S7 —*unlocked! | Android Central
Where to buy a U.S. unlocked Samsung Galaxy S7 or S7 edge | Android Central
If you chose to go with the International version, it depends on the seller which charger you get, but they usually bundle a converter if the version they sell has the European charger. You'd be missing Samsung Pay, WiFi calling on most carriers, and of course, carrier-specific apps/features. And of course the different processor. Other than that, you're not missing out on a lot (but again, Samsung Pay is a HUGE thing to be missing out on!). The International version has the Lab thing that the US version doesn't have, but I doubt many people use that hehe.