Xbox 360 was the first to be released and it has great new gaming, like for example: Gears of War, Elder Scrolls: Oblivion, Dead Rising, Saints Row, and many others. And do not forget that Halo 3 its coming in this year, and this is going to be the best selling game of the year, ... maybe??
So in fact Xbox 360 has already great games for it's system.
And what about Wii?? We cannot compare the Wii grafics with Xbox 360 grafics, but the Wii remote is by far the greatest thing to happen in a video-gaming generation. Do you think that the Wii remote will turn Wii games even better, by its playing system, and that new games for the Wii will become better than Xbox 360 games???