Facebook ads vs. Google adwords

[BigTimeHockeyMom]

Which do you think offers more bang for the buck when you want to advertise your website: Facebook ads or Google adwords?

[suwunk]

The Facebook ad creation process is different from AdWords. You target people’s interests rather than their search phrases. You’re targeting people based more on who they are than on what they’re looking for right now. These people may be a bit higher up the sales funnel, unless you control that in the ad copy.
Facebook Advertising vs. Google AdWords | Search Engine Journal (http://www.searchenginejournal.com/facebook-advertising-vs-google-adwords/25532/)

[Alexjones284]

Which do you think offers more bang for the buck when you want to advertise your website: Facebook ads or Google adwords?

Off course Google Adwords.

You can only bang big bucks when you get targeted keyword traffic on your website. There are many keywords but buyer keywords are different. So if advertising is done for branding purpose then FB ads are good but if done for "bucks" then target search engine quality traffic requires which only Google Adwords can provide.
I run a web hosting review blog and my buyer keywords are different from a web hosting company. So the key to success all these ad campaign is to find the buyer keyword for your business. You have to bid on those keywords where people are just ready with their credit cards to pop up in your bank.