Microsoft in my opinion.

Brand name isn't PR. ;)

MS is not a consumer products company, and it shows in their very poor PR. Sony is not much better, with some of their arrogance showing through this generation.

As far as commercials I think Sony does a better job. I seem to catch a regular stream of them while MS I seem to only see coverage of particular titles and times of the year. As far as public statements I think MS does a better job, Sony I feel like thinks I am a moron by making outrageous statements while MS seem more realistic. Sort of the Sony says, "we are not competing with the Wii it is a toy" while MS says, "Nintendo has won we will fight Sony for second." Then again that is not really why I bought a 360 instead of the PS3, it was price and the Netflix announcement.