One has better hardware, is cheaper, has less expensive online play, and has more established exclusive franchises. They may both be [i]good [/i]choices in your eyes, but one is the better choice. To those whose money is more precious, they very well may see what appears to be a marginal difference become very significant to them, and therefore one may be terrible and one may be great. Shoot, the marginal difference between Halo and Call of Duty isn't that significant, and yet you see people flip their shit over how awesome they perceive Halo to be and how poor they believe Call of Duty is.