They're different. The G is a mighty Colosseum with an atmosphere like thunder; AO is beautiful and also has fantastic atmosphere but only half as many people get to enjoy it. Both have swirly winds that are hard to read.
What were the prices of this game like? I know this is a massive international competition and all, but I think the finals have been slightly overpriced, especially for Aussies that are fatigued by the massive amounts of cricket that's been on, and how long this competition's seemed to go for.