Answer:
The game is new and that gives you a better chance to get to know the game. Call of Duty Modern Warfare 2 was released over 6 months ago and the people who play it also had the experience of the earlier versions of Call of Duty. Red Dead Redemption is very highly rated and shows every sign of being a top selling game. Whether it better is more of an opinion and is not important in answering the question is it worth buying.