Disclaimer I have only played Met Pro and GOT Premium, so can't comment on GB at all Before I played GOT I thought maybe my next pin would be Met Pro, I have heard the hammer isn't worth the premium, so as a pro it is a good package. Plus I like the music, art package, and layout.
I played GOT recently and really liked it. Would I like the pro as much without the premium's better dragon (I don't know)? My opinion is GOT would be better in a small collection due to rules and modes. Also, for me it is a more kid friendly theme even though they can't watch the shows. The only reason I say that is because is because if you don't know the show, like my kids, it is just a kings and knights theme.
Both are nice bright games, which I love.