I'd like to remind everyone that Killzone 2 has been in development since 2005, while Gears 2 probably started in mid '07. So the fact that we can even compare them (even if KZ eventually wins out, which I think it does), speaks to the power of BOTh systems.
Also, I don't know if anyone read the OP without their fanboy goggles on, but he clearly said, "But they are so close that really there is no definitive answer."







