Vaza on 24 September 2008
Developed on PC > Ported to PS3
PC > Ported to X360
That's the most logical way of doing it, no way will S-E port a PS3 to 360, PS3's don't share as similar hardware to 360 so it would take a very long time (heck, it took a year for 360 to PS3 Bioshock, imagine it in reverse + extra).