Both of these are next to each other at a local location. TWD is a far better shooter the GB. Previous posters saying the opposite must have Outland extenders etc.. on their GB (which is fine) , I just can't imagine any other scenario where GB plays safer then TWD. Personally I don't find TWD too tough, played multiple tables and few cheap drains, occasionally out of the pops but you can usually anticipate and nudge. With GB it just has far too many cheap drains, seriously couldn't even begin to list them all. GB is not keep you on your toes difficult like TWD with the adrenalin that comes with keeping the ball alive. It's just cheap drains that have nothing to do with your shots or skill level. You end up having to play the game super stop and go to have any hope of progressing through the ladders.
Have you considered Metallic? Not a big fan of the music but of all the table still in production it's probably Sterns best all rounder.