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But for the purpose of agrument, San Andreas will be much, much better than The Getaway 2.
There may be another contender that you're forgetting though: Mercenaries. There's a huge city just like GTA, but every building is destructable and the damage remains throughout the entire game. You can steal/buy cars, weapons, helicopters, tanks etc.
You can also work for terrorists groups if you want, or on the other hand you can be the good guy, or alternatively you can play both sides against each other. Sounds like a brilliant game, and some real competition for GTA.
EDIT - Oh, you do see.
EDIT: Yes, I see you do.