Some early reviews have come in.. It definitely appears that there's no overall advantage over the other. Seems to come down to what you need more in a device and what you're willing to put up with. I'm debating whether or not to get one of these or an AT&T version. I REALLY like the idea of not extending my contract and having access to T-Mobile's LTE network as well, BUT the idea of throwing down $600+ for a phone isn't very appealing.
https://play.google.com/store/devices
https://play.google.com/store/devices