DECISION 2009: Wii or PS3

For a few months I've been thinking about buying a video game system for my room. The only question is which one do I get: Wii or PS3? I need some help here....

I think I'll like the Wii because of the fun sports games that are interactive. One the other hand I've been told that PS3 has more games that are adult oriented and keep your attention span. The PS3 is about $100 more than the Wii however I've also heard that you can play BluRay discs on the system as well as previous games from PS2. I don't know too much about the Wii, again I need some help for Decision 2009.