Default Which US variant to use in Brazil?

Does anyone know which US variant would be best for use in Brazil? From what I can see the ATT version has band 7 LTE and the TMO version does not, and LTE bands page (below) shows that most carriers there are band 7. This would seem pretty conclusive but wanted to see if there was anything I wasn't thinking of.

Thoughts?

Thanks,
BH

PS - Side question. If I pay full price/not-subsidized for the ATT model, does it still come with a subsidy/SIM lock? I asked Moto cust svc and they say it's locked, but wanted to verify.

http://en.wikipedia.org/wiki/Moto_X
http://en.wikipedia.org/wiki/List_of_LTE_networks