PS3 is slow but...
I have PS3 and Xbox 360 Slim.
Xbox good and bad things:
-Difficult to use
-You get lost in marketplace
+Great games!
-Heavy controller
+I like sounds
+Wireless!
PS3 good and bad things:
+Easy to use
-Not very good games
-Sometimes slow
+Small and light controller
-Need wire >:(
So I think they are both good.