I've only been to BGT but BGW looks nice too, BGW has some world class coasters (Alpengeist, Apollo's Chariot, Big Bad Wolf) as do BGT (Montu, Kumba, Gwazi) But BGT has better theming, the whole Africa theme is amazing and the water rides and the zoo is just great. At BGT you'd never get bored. I think BGT is better, and plus it has Adventure Island (a nice little waterpark) right next to it!!
Dude G-Force, you gotta stop doing these which is better polls. Whats the fascination in them? There must be about 8 polls from you, all saying the same thing...