This should be a WW bet, it's not fair to exclude regions.
And I'd prefer a 6 month bet, because that's when I think SSBB will pass GTA. I do expect GTA to outsell it at first...I've been talking about the game's long legs though. A quick burst of sales with the 360 and PS3? Yeah I think it'll undoubtedly outsell Brawl at first...within a half year though? It's possible for SSBB to pass it I think.
LEFT4DEAD411.COM
Bet with disolitude: Left4Dead will have a higher Metacritic rating than Project Origin, 3 months after the second game's release. (hasn't been 3 months but it looks like I won :-p )