Well first of all I'll state the obvious and say the games are from two completely different genres, and one of the games hasn't even been announced.
Secondly, although there's still a chance GOW3 will make '09 I think its doubtful but it will hit early 2010, probably March, whereas I think Gears 3 once/if its announced will release in the Fall of 2010, so basically no they won't be competing.
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