To say that Microsoft as a whole is a greater company simply by revenue and the success of the 360 is simply opinion. Microsoft is indeed a great company in general but doesn't have the same influence in the movie and music industry as Sony does.
With the recent buyout of BMG, they now assert more control over multiple labels across the world. Their movie division raked in more than 8 billion in '07, and although their cell phone division is no motorola, it still holds it's own.
As diverse and dynamic as sony style products are, Sony is by no means inferior to Microsoft, as most of their revenue come from software sales.
Plus if Microsoft is so great, they wouldn't be spending so much money fighting multi-national anti-trust suits against entire countries.
