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...facebook is an absolute winner in this category. I myself prefer g+...but it's a wasteland there.
Twitter is well better than both of them.
Both Facebook & Google+ are important to drive traffic and engage the audience by posting unique content and images.
For business purpose, Facebook is better than Google+. You can run an ad on the Facebook.
Facebook anytime. As you get more potential customers there.
Google plus is no for me.
Facebook is the right and first choice. Even though Google Plus id the product of Google, Is doesnt matches or competes with Facebook. Facebook is the only social networking site which is used by more than 2 billion people. Always go for Facebook.