Best system on the market.
1. Great Games- Xbox 360 has arguably the best selection of games available thus far, with great titles such as:
Mass Effect, Gears of War, Bioshock, Call of Duty 4, Viva Pinata, & Soul Calibur 4, to name a few.
2. Graphics- Though not as overall appealing to the eye as the overrated PS3's Blu Ray, Xbox 360 has games that actually MATCH up to the standards of almost nearly PS3 title you can name. Gears of War, IMO, is STILL the game with the greatest graphics ever.
3. Online- PSN is free. SO? 360 has MUCH more- a larger, friendlier community, better online games, has the Xbox Marketplace, and has MUCH better Arcade games than PSN.
4. Exclusives- Many of the 360's exclusives have ported to other systems, simply because they are THAT good. Some of these titles include Bioshock & Gears of War.