I wish Google Analytics had easily embedded'able public stats graphs like QuantCast does. It's the main reason why I have both on our sites. Plus, QuantCast is suppose to be better with picking up new advertisers. (not sure, but I think so)
Then again I remember seeing a section in Analytics that allows us to give Advertisers more control of our stats as well.
so the question is.... Should we have both embedded on our sites, for maximum exposure to attract new advertisers ?