Id say from the people I know, XBOX users had 25-30% of serious hardware fault (requiring replacement or repair) within 12 months of new.
I saw that continue with some of my friends on their 3rd XBOX now.
My PS3 died 18 months in and based on my friends I would say about 10% failed within 12 months.
Probably double that for 24 months.
I did buy a replacement PS3 instead of an XBOX as I was familiar with the PS3 and I still see it as a quality product, I particularly like the range of media options and the use of standards such as hard drives, USB ports, bluetooth, wireless built into one package.
Free net access was important for me (although now I have got PS plus which is £40 a year or using the deals £31.00 a year/£40 for 18 months whichever is active at the time) but that also gets me a load of content in the year, far too much for me to use it all.
Will I get the next Playstation? Probably, I am a PS man and I am familiar with the controls, way of playstation and PSN so the next one will build on that, but for now, PS3 is great for me and people in my family to use almost every day.
I know XBOX people who relegated that device to a bedroom as it is seen as just a gaming machine for that person/type of person. Sony aimed the media features at a different type of person, and that suits me.
+How can anyone miss out on LittleBigPlanet and Uncharted??