I prefer Sony over Microsoft and the PS3 over the 360, because I had problems with my Xbox. Microsoft has no clue what it is to make a reliable system.
My Xbox died [the original Xbox] on me just in a year. I have my PS2 which still works somewhat new, that's 8 years of service and its still working with an exception of a few games. Where as my Xbox is broken after a year of service.
The Xbox 360, I had got RROD. And when we got it back it has been working nicely. But slowly its beginning to show signs that it might RROD again. And now its no longer under warranty.
My PS3 is having problems now too. I'm afraid of taking games out because it seems like every time I take out a game that was working fine just a few days ago, the PS3 no longer reads it and starts making a clicking noise and shuffles the disc around.
Even still, I am a Sony fan all the way.
Think about it, the original Playstation had some serious serious issues, overheating I remember having to put ice packs on it, dying, crashing, etc. But then the Playstation 2 came out. I have had mine since 2002, 8 years and they managed to fix almost all the problems of the original Playstation.
Microsoft failed with their second console. Xbox broke and the Xbox 360 is just as broken.