I just ordered the standard edition, you don't really seem to get much for the special edition.
If you are thinking about platforms, then I think PS3 is probably the better one. Given that it is based on the RAGE engine that performed slightly better on PS3 than the 360 for GTA IV, if you can take the install then that is probably one to get. There is also some exclusive content, though I don't really know the extent of that, and for me, free multiplayer is very nice







