Xbox 360 for me, just because of Xbox Live and their controller.
The system was poorly made.
Xbox 360, mostly because most of the games I play are on it and many friends have it too For example the extra versions of GTA IV are still X360-only, which is a big benefit IMO
My vote goes to 360.
mine is XBOX 360..
Voted for PS3.
Don't get me wrong, I love all systems and X360 also, but I have this thing for Sony games and systems. Valkyria Chronicles, Metal Gear and Gran Turisom Rock! Plus the exclusives on PS3 plus linking with the PSP is hard to resist. I am glad they have a strong system, but they need more sales though!