GummyCol said:

Seriously, 2K really think I'm going to pay more for a inferior game when I get the better version alot cheaper...
As you can see, the lighting for the PS3 version is indeed better but the textures are far more superior on the X360
If you're thinking of picking up a copy of Bioshock or missed it when it came out, buy the X360 version since its cheaper and has the same story and gameplay as the PS3 version.

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I actually took the time to compare the two versions today. (The 360 version which I own, and the PS3 demo version.) They both look pretty close, with the PS3 version edging out with some better lighting/colour.
Oddly enough I was actually examining that particular Big Daddy's head in-game from the screenshot you posted, only a few hours ago. For some reason it's really badly pixelated on the PS3 version. Almost like the developers 2K missed a spot or something. You also have to go up very close to notice it. A few feet back and it looks the same.
That Big Daddy's head does seem to be somewhat of an exception, in that having combed through the entire demo length of both the PS3 version and the 360 version one after the other looking for flaws and glitches, it was pretty much the only thing that looked noticeably different on the two versions, and most certainly would not have effected any gamers experience.
I'm slightly confused as to why you think any 360 owner would have waited until the PS3 port arrived to make a decision. However based on the fact that all the DLC ships on the disc and that some bonus content is being added to the PS3 version, coupled with the better colour/lighting, the PS3 version, in my opinion, is the superior version.
Edit: Although you do have a point about the cost.