If you own a PS3 plug via hdmi on a HDTV then go for it.
You will see that this is a great game and you should not have any problem since 1.4 is out.
When playing, you will not see the difference between xbox and ps3.
If you have a good pc that can run Skyrim whit all graphics at max and the texture mods whit a monitor that support 1080p then go on pc
For me, I like to play Skyrim sitting in my coach in front of my full HD plasma, but that is my opinion.
Hope it help you.