GTA 4 will sell over 20 million copies PS3+X360

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leo-j said:

. . . The two biggest consoles in the industry . . .

 If by 2 biggest you mean:

1) Physically biggest, as in bulkiest

or

2) Biggest as in #2 and #3 out of 3 consoles

Yes, they're the biggest. 

 

GTA4, however, will sell like crazy. My guess is

Opening week

360: 1.5-2 million

PS3: 1 million

Lifetime

360:  13 million

PS3: 8 million

 

I think it'll sell more PS3 systems than 360, though, since most of the 360 adopters probably hopped on between Bioshock and this coming Christmas, Halo 3 being the flagship title right in the middle of that span.