This isnt based on how fun it is,CoD4 has meh graphics.

Bioshock ftw!

Results are in, Bioshock wins by a considerable margin: 25-15!

I like COD 4's graphics a lot, but Bioshock looks so much clearer, so my vote goes for Bioshock.

cod 4

It's actually based on UE2.5 that was heavily customized. 

My vote goes to Bioshock, COD4 loses some respect for sub HD resolution.

bioshock.

Kind of surprised by the results here.

While I enjoyed and played Bioshock MUCH more than CoD4, from a technical standpoint, CoD4 was more impressive in terms of realistic visuals. While the lighting of Bioshock was far more dramatic and effective than the realistic natural lighting of CoD4, ultimately it boils down to Bioshock looking more like an imaginary world inhabited by plastic and wooden puppets.

For the record, I bought COD4 on the PS3 and PC (max settings) and Bioshock on Xbox and PC (max settings). And I still think Bioshock is the better game, even though CoD4 is more visually impressive.

Bioshock is the better game, and has the better graphics

Bioshock