one is the biggest electronic company in the world and the other is the biggest software company in the world
SONY has sold 300 million home consoles more than 50% of the total number of home consoles sold
MS is the newest player in the Console gaming Scene with around 60 million total home consoles sold
Sony has an large collection of First party devolopers plus an array of 3rd party deals since PS1 and PS2 like Nintendo
MS is still building its First party and 3rd party deals up
MS is spending 500 million on kinect marketing launch
That is probably SCE entire Marketing budget could be even less.