I think adward PPC is better than face book PPC. Actually google adword PPc have run from long period of time due to this reason adword ppc is more valuable than facebook.
Facebook PPC is debatably the most exciting, targeted and effective new standard of advertising in the online marketer’s toolbox. Not only 350 million active users are browsing but also averaging more than 55 minutes per day on Facebook in 70 different languages, but the massively targeted approach is unparalleled. The ads can be targeted by keywords, age, sex, language, location, relationship status, political views, education status and workplace. So today, i think you should try for Facebook PPC advertising method.
I would have to say that adwords are DEFINITELY better then facebook. I have been advertising on facebook for about a month now and have had 155k impressions and only 19 clicks..... While the same time i have been advertising on adwords and have had 900k impressions and 300 clicks...