There's the full rundown on what version has what. That site has that for pretty much every phone as well. It does have 700Mhz, so when/if 700Mhz LTE is deployed around you you'll be able to pick it up. The ATT version has more LTE bands, but the T-Mobile version has more HSPA bands (1700 is missing from ATT). It really doesn't make sense to get a version other than your carriers version for band support most of the time as while a given version may have more bands, your carrier probably isn't using them anyway. If they were, their phones would include it as well.
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer? | Terms of Service