Uncharted 2. Superior SP and no QTE (which suck in almost all games and even in GoW games). Love some of the GoW3 set-pieces, but Uncharted 2 was better paced, more varied, had better narrative and much more involving gameplay as well as a good MP mode and a very fun coop mode.
Love GoW3 graphics though.
Try to be reasonable... its easier than you think...