Which version to get

Hi all. I am thinking of getting a 950 XL but don't know which version I should get. I see Amazon and Ebay have Dual Sim international versions available and Single Sim international versions available. I also see the Microsoft store has the Unlocked Dual Sim version which I assume is the Americal version. I am in the U.S. on AT&T, any advise on which version I should get would be helpful. Thanks

Also, if anyone knows of anywhere else I could buy one other than Ebay, Amazon or the Microsoft store, please let me know. Thanks again.

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