1. Xbox 360's home menus's actually make sense (Playstations doesn't)
2. The Library of games you can get on Xbox 360 is waaaaaaaaaaaay superior to Playstations.
3. If it weren't for the Xbox the greatest first-person shooter game on console would have never came out, HALO (which also the playstation doesn't have)
4. The controller of the Xbox is much more comfortable and easy to use
5 .And for all the Call of Duty fanboys, all the COD DLC comes out first on Xbox 360
The X-Box 360 and Playstation 3 are two different systems. Each has its fan base and members of each fan base will tell you that their preferred system is the best. Essentially, however, they are equal. They both serve an entertainment need in the form of gaming. So to say one is better than the other is to say that apples are better than oranges.
The Playstation 3 has better graphics, better games and better hardware than the Xbox 360. It's all in the HD, which the PS3 was made for in the first place. The Xbox 360 may have better online playability, but Sony cornered the market in graphics and hardware. Now if someone can just perfect zero controllers with just body motions for controls along with fantastic graphics, that's the ultimate gaming system short of a holodeck from Star Trek.