re: Nexus U.S. vs international version?

So I'm just realizing that my current phone (Nexus 5) is also an international version... So I should be good. I've never really had any problems with signal or anything except, sometimes In a building like a big school or hospital I don't get signal while my friends with other carriers do. I just always assumed it was a signal issue with T-Mobile, but is it possible that the international phone has worse reception or maybe just my particular phone is a dud.