360 has Achievements, why can't the PS3 have trophies?
I would get a 360 copy but I'm sick and tired of Microsoft and the Xbox360. I've bought 4 Xbox360s in the past and all of them got the rings of death. Even if they released the Elite, I will never invest my money in Microsoft's consoles ever again. Plus, PSN is FREE!!

Because the PS3 trophy system wasn't made compulsory for new games until 2009, 2 years after the PS3 release of Oblivion & 3 years after its release on the Xbox 360 & PC formats. All new games are required to have trophy support, but GotY editions released after the start of deadlines, more than likely don't.
A question for those who play Oblivion on a console that awards trophies / achievements. Can they be disabled by those who do not like the concept and don't wish to participate?
-Decrepit-
I've not played the 360 version of Oblivion since 2006/2007. but as far as I'm aware, there is NO way to disable trophies/achievements on either console, on any game. You can't really play to avoid the trophies, as there's countless for each guild, as well as the main quest.