GB premium. Better theme integration, superior art + DMD animations, better / more original music, and more interactive toys.

Dragon vs Slimer: The dragon in GOT is neat but doesn't interact with the ball. Slimer does interact with the ball, moves up / down and to different shots on the premium.

Ball lock: Mini sword ball lock on GOT vs large steel ramp on GB that drops under the playfield that is also intergrated with a ball lock + VUK / scoop shot

Other toys: Kicker, battering ram, throne and 4 drop targets on GOT. GB has a peppers ghost Ecto Goggles toy for 3D animations, magnetic slings, two drop targets in the middle of the playfield, the subway ramp + ball lock, 2 scoop shots, 2 captive ball mechs

Molded toys: GOT has the throne. GB has the firehouse, libray and storage facility.

I do think GOT is fun and has good code but for todays crazy NIB prices GB premium offers the better value for what you get.