There is no right or wrong answer to this. Listen to how they describe the environment, what and with whom you will be working and just tell what you feel/think. If the culture match is achieved, you will get the job and the company will get you.
> holistic advertising package (campaign can be run from branding with video ads to closing a sale with shopping ads) > breath of data (from Google Searches, Google Maps, Google Shopping, Youtube, Google Hangouts, Gmail, ...) that optimizes personalized targeting > high flexibility (allows daily budget adjustments, can be instantly paused upon request) > easy usability > offers both manual and algorithmic management I think it's really the first and second point where Google has an edge over Facebook. While Facebook is constrained to the scope of its platform i) in accumulating data and ii) reaching customers, Google can fall back to a portfolio of different channels.