I'm pretty sure both have Bluetooth only. As for which is "better" that I'd say is what do you intend to do with it? Will you be riding in groups and want to easily keep track of each other, then the XT2 sounds the better bet. XT has it's foibles, which Garmin don't seem to be moving quickly to correct. Probably as they have beta testers now with the XT2 and it's keeping them busy.
There's an XT / XT2 users group on Facebook, or the zumo users forums might give a better opinion than me. Personally, I don't see me changing to the XT2 and certainly don't see the value for me in paying out a couple of hundred pounds for the XT2.