I'm going to buck the trend here and say Killzone 2, unless Forza 3 sees the same bundle treatment Forza 2 did.

Here's the comparison chart pitting Forza 2 against Killzone 2. Neither is a very remarkably selling game, but it's obvious Forza 2 wasn't doing very hot at all until it's bundle treatment. It shot the sales off like a rocket.

Hm... where have i heard this before... oh, now i remember!

http://www.vgchartz.com/forum/post.php?id=2244153

I'm going to buck the trend here and say Killzone 2, unless Forza 3 sees the same bundle treatment Forza 2 did.

Here's the comparison chart pitting Forza 2 against Killzone 2. Neither is a very remarkably selling game, but it's obvious Forza 2 wasn't doing very hot at all until it's bundle treatment. It shot the sales off like a rocket.

forza will sell more then Killzone 2.

I see it as Killzone 2 Vs Halo and Forza VS GT.   They are each others antithesis to each others goliaths.  So then the question remains, will Forza be more effective than Killzone or will Killzone be more effective. I personally think Kilzone 2 will sell more because it has the best graphics in the world on the most powerful system in the world and uses the full power of Blue ray and the Cell.

Wow, could you be more of a fanboy? Forza3 has graphics that make Killzone2 look like a cartoon, also, Killzone does not have the best graphics in the world...I really don't think anybody who has a brain can actually think that. 

Killzone 2 is the greatest looking game ever created and is at least 10 years ahead of anything that will come out on the Xbox 360

XD what? GOW2 and Forza 3 prove you wrong.