I have an Xbox, though through the looking glass and with 20/20 hindsight, that was because at the time, PS3 was a joke. About a year after its release. The joke 'no gaems' actually had meaning.
With the sleeker models, smaller system, no risk of overheating, (Although newer Xboxes have little risk as well) very few online advertisements AS WELL as free online, the choice is almost exceedingly obvious.
PS3 is the better choice from a logical standpoint, because Microsoft is a whore and takes you out of the game way too much. Not to mention the PS3 gets a lot more eastern games, although western games such as Skyrim tend to suffer on the PS3.
However, I don't own a PS3. As I said with 20/20 hindsight, I kept my Xbox since release day for many many years... but a PS3 was always 'just' out of my grasp. It's your choice though. The next generation is close, so you may want to wait, like BL said.
"It's such a fine line between clever and stupid."
The Chronometal Wars, a fan-fiction taking place in the PPGD Universe. Catastrophe is the only certainty.