I think that Black Ops will probably be on more systems. So it will probably sell more in the end. Assuming it gets Vita, PC, Wii U, Wii, PSP, 3DS, PS3, 360.
Below we see that CoD wins. GTA has never sold over 21 million copies.
Here is GTA. Black Ops is big!
Xbox + PS2 San Andreas is over 22 million.
Book - Malazan Book of the Fallen series
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