[quote name='icruise']Also the fact that the 360 doesn't have a hard disk standard is apparently causing problems.[/QUOTE]
Actually the person who made those comments in Official Playstation Magazine, Dan Houser, said that both ps3 and 360 have "enormous challenges".
[quote name='OPM']He continued, "To be honest with you we haven't solved all those riddles yet." The difficulties aren't limited to working on Microsoft's box, as Houser explains that "both have enormous challenges" and that "both have their own particular pleasures and pains".[/quote]
Its also worth noting that Rockstar has been using the 360 version to show off the game to the press, if there were serious "issues" with the 360 version, or the ps3 version ran/looked better they might as well use the PS3 for demos.