I have to pop in here and update my opinion. I was able to play a GB pro at Pintastic in an almost empty vendor hall yesterday morning so I could hear and enjoy what was going on. Had a great game (I always have beginner's luck on new machines, then it goes downhill from there!) Loved the game - it was a hell of a lot of fun.
So here's my revised opinion (and keep in mind I'm a GOT LE owner):
Gameplay - both machines are a blast
Art - both playfields are ugly as sin, but at least the cabinet on GOT LE is awesome
Sound/Callouts - both excellent, although it looks like Dwight just built GB on top of the already-coded GOT (slot machine, anyone?)
Music - Both good, although the GB theme gets on my nerves after about 5 seconds, whereas I can listen to the GOT theme all day.
What is comes down to is this: They're both excellent games, and it really comes down to which theme resonates with you more. I'm not sure how much "lastability" GB has in a collection because I didn't play it enough to know. GOT will be in my collection for a long time because you can approach that game from a thousand different ways.