It depends on what you want in a full back. Gamboa is my preferred choice because I like attacking full backs who give the team an extra option in attack whilst also being able to defend well.
To answer Willie's question, Gamboa's main position is as a right back. For club that is what he has always been. For Costa Rica, he has been used as a right back and as a right wing back. This is because the current coach and previous coach like/liked to change between a normal back 4 and a back 3 with wing backs depending on the match opponents, match importance, available players etc.
To answer Willie's question, Gamboa's main position is as a right back. For club that is what he has always been. For Costa Rica, he has been used as a right back and as a right wing back. This is because the current coach and previous coach like/liked to change between a normal back 4 and a back 3 with wing backs depending on the match opponents, match importance, available players etc.