Windows Vista Gaming Will Answer the Keyboard/Mouse vs Controller Debate

With the release of Windows Vista and Microsofts push for cross-platform gaming where a PC gamer can play against an Xbox player the XFPS keyboard/mouse adapter may come in handy. This little device allows you to hook up a keyboard/mouse to use in your Xbox 360 games. Xbox 360 Fanboy has a review but says that using the keyboard/mouse combo has too much lag for first-person shooters. The comments over at Gizmodo had people in an uproar saying that it wasn't fair because the keyboard/mouse combo would allow more accuracy against a controller. But with Windows Vista where PC players can go up against Xbox 360 players it might not matter anymore.

So what do you think is better for first-person shooters like Gears of War: the keyboard/mouse or the controller?