Do not own a PS3 but my brother does and I have played it a fair few times, but I do own an Xbox 360 and my vote goes to Xbox 360. Always preferred it over PS3 probably because I'm mainly an online guy and even though you have to pay for Xbox Live, I believe the online service is far superior than the Playstation Network for a few reasons like ow voice communication with friends works and there is much better servers for most games. Here's an example of Microsoft's effort with their service from the next gen conference yesterday: "When Xbox Live launched in 2002, it was powered by 500 servers, then on the Xbox 360 launch it had grown to 3000, and today 15,000, but this year with Xbox One it will grow to an astonishing 300,000 dedicated servers, more than the entire worlds computing power in 1999." I don't find the graphics between Playstation and Xbox much different either. And could care less for a built in blu-ray player. One minor thing I do not like with Playstation is the controller, the Dual Shock is just too small and I don't like the thumbstick positions.
My response probably sounds like an Xbox fanboy response and a bit bias, but I'm going by what I know by the two and I just find Xbox better. And I will once again go with Xbox later this year over Playstation. Xbox One impressed me much more than the PS4 and Microsoft showed A LOT of confidence with the console.