Do you prefer run and gun, less tactical action (COD 3), or somewhat more strategic, run, take cover, fire, take more cover action (GoW)? I've got both, from a graphics stand-point, Gears of War easily wins hands down. But they are different types of games, so I'd say go with both, Gears first, just for something a little different. Just remember when your staring at 5 angry locust wanting to blast your face off, you need to take cover instead of charge, or you'll be splattered all over the map in a rather gorgeous display of graphical prowess.
