Hmmm.....debatable one. I'm sure there will be members who don't agree with me.
For blu-ray picture, there shouldn't be any difference in the picture quality.
If you're going to allow the player to decode sound, then the S760 should offer superior performance. But if you're bitstreaming it to a good quality receiver, then there shouldn't be any difference to sound.
For DVDs, S760 should be a better upscaler. Again, if you have a good TV, it should upscale DVDs just as good.
It really depends on what you want out of your player. If you want a versatile player which is also a media player, an internet browser, & ofcourse, a game console, go for the PS3. Some users have experienced troublesome fan noise. But apparently, the newer PS3 is better at that, & if you ensure good ventilation, it shouldn't be a problem.
If you're not bothered about games & want to buy a blu-ray player only, then the S760 is a no-brainer.