I own/owned both GOT and GB pros and GOT is a better playing game. Sounds and music are better on GB. Fun factor they both have there moments just more of them on GOT.
The difference in the two is GB you can only play a few strategies on but GOT you can play different every time. Like yesterday played game as Greyjoy and tried to steal Martells powers then i used Lannister because there the hardest house to use then Martell because there the easiest. Each game felt different.