Bioshock should most definitly be on the PS3! The PS3 is like 10 times more powerfull and worthy then the Xbox 360, plus if they were to add any online features, it would be free instead of having to pay for stupid Xbox live. The graphics would be clearer and the controls alot easier. PS3 would be the way to go!
I'm not saying that it shouldn't be on Xbox either, but PS3 deserves it more.