At the moment I'm really glad I decided to get a PS3. Normally I watch and read about many, many games, but never have the money nor time to be able to play them all. So naturally, I pick and choose, and most importantly look out for exclusives that interest me. Well it's paying off.
The Ratchet & Clank Series
Top gaming there, Yakuza 3 being an absolute stalwart. Don't get me wrong, I'll be playing some multi-format games too (Red Dead redemption in a few weeks, hallelujah), but to see that the format gets plenty of good quality exclusives is a nice thing. The 360 has plenty of goodies too, but personally, they're not to my tastes.