Definitely facebook has more traffic than google+ but it can be overcome after certain month on google+.
Google+ is more effective in term of Index your new post faster, sure facbook got 800 Million active Users and Google+ got 40 Million Active users
I think G+ has better interface, however Facebook win the popularity, so Facebook still the best at moment
No doubt both are important for SEO,SMO and SEM because its give traffic and visitors ,and most importantly now a days both are the precious gift for online marketing.facebook and google+ are the best networking sites for promoting brands and make good reputation among users.And for me Facebook is best because it is more user friendly and it has captures good image among all users.
Of course Google+ will help your site in ranking. It helps your content to get indexed faster and also if a person once +ed your content it will always show him/her in the first page of the results of you keyword. So you gather the audience for you site easily.
i think fb has more traffic for now, give g+ maybe a year or 1.5 and there traffic will be more than fb, example android phones
As Google+ and Facebook continue to try to one-up each other with user features and benefits, throwing barbs at one another in press appearances, the biggest difference between the two may also be how they are most alike. They both want users on their service active engaging in ways we wouldn’t have dreamed possible a few years ago, leaving IP addresses, usernames, GPS coordinates, personal preferences, shopping habits, and more on the table. Google+ wants all of your personal data to target you for advertisers and potentially for use in some unknown way in coordination with the federal government. Facebook wants all of your personal data to target you for advertisers and potentially for use by third-party with whom they partner.