help im lost

[Zapshenko]

I was always using the iPhone but I've taken an interest in androids particularly HTC just can't seem to like Samsung devices. I am thinking about buying an HTC one x used but I wanna know if I should get the global version or the AT&T version. Regardless of which one I buy I have to unlock it because I live in Jamaica. I have always bought jailbroke n unlock my iOS devices but I've never owned an android so I need guidance on what's are the best options n where i could get a used one reasonably.