Both are good as both are social networking sites and a good source of traffic. But in the eye of google search engine g+ is better.
If you want to choose one between Google9+ and facebook, I think you should take google+. It will make a better impact on SEO advancing.
Hi all, Looking from the SEO point of view both Google+ and Facebook are better for bringing traffic to our website, it may vary that how many friends are you having on both of these. http://www.dimensioniseo.com/
Of course Google plus always do their update by the Google now . Also It have do follow link . It have done two work now . One is social media work and two SEO service which is step one ahead by the others.
In regards to traffic Google+ is definitely a good source of additional traffic to the site. But it works only in the case if the G+ account is "live". I mean that it's not just a link to your website from any "dead" or fake account. Regarding SEO benefit of the link itself, I personally didn't notice any improvement in rankings for my websites, though there's a good amount of G+ likes that I receive.
G+ offers many features that are more beneficial for SEO purposes. In other words, we can say that it is more SEO friendly.