I would be very skeptical that you would see or hear any difference in basic performance from any of the current BD players. I can't say for sure because I haven't tested any other than the S300 I own.
Obviously the PS3 is a game machine and has that additional capability. The 1.1 machines are coming soon and those would be an option if you want PIP or some of the on-line added features that this technology provides. I think that is the more important issue. Personally, I don't care a whit for these additional features but you may. Make your decision based on the current or the new 1.1 machines.