Frank Caron from arstechnica writes:
"With Grand Theft Auto IV creeping ever closer to release, I find myself debating which platform I should buy it for. Early previews of the title from outlets around the globe suggest that the two are virtually identical: a parity that has been a long time coming. The Xbox 360 versions of multi-platform games have generally been the superior versions: it's hard to break that preconception.
Both Rockstar and Sony have commented that this notion is slowly being disproved as the era of PS3 infancy has come to an end. As one IGN article points out, the core differences are as inconsequential as some "minor visual differences," as the 360 version is "brighter and has slightly more vibrant color" while the PS3 version "has less aliasing issues." So, then, the only question that remains is one that's not quite so easily answered-at least for me.