IMO, both are good sites for SEO. Particularly because Facebook still has the most users (more or less) and Google Plus is powered by Google. However i think there is a lot of potential for Google + in the future...
Both are good for SEO but Facebook is a better place to get more traffic. Google plus is still growing and will be soon overtaking FB in SEO purpose.
Google+ is better than Facebook for SEO purpose because professionals are using G+ for business purpose. Facebook has more number of visitors than any other social networking sites but mostly they are using facebook for general relationship.
In terms of Google ranking, Google gives more score for Google Plus since it is their own social network. However, Facebook is still better in attracting more audience since more people are still using Facebook. This depends on your niche though. As others said, just use the two of them.
Still Google+ doesnt get more audience in India than FB. I think the feature is so nice and flexible at FB. As a community site FB is nice than G+. Yes, I agree that google giving preference to G+ in SEO. But for good traffic on a site, FB is still a big Platform. Thanks
Google plus is much more impressive and better for SEO purpose than face book. It is product of Google family who supports SEO Works. On the other hand, face book is famous site among millions of people and can increase your traffic.
IMHO, Google + and Facebook are both beneficial to SEO... Most people use Facebook than Google +, while G+ can provide do follow backlinks...
Although its Google's own product but I don't think that Google would do partiality with its other dependents. Internet marketing India
I am sure that Google+ is way better than FB for SEO. For instance, in Google + you can add links to your about page. In FB you do not have such an option. If you submit an article in Google + it will get indexed much faster than if you add it to 20 social bookmark sites. And last but not least, Google owns Google + after all.