Google+ to get better rank and find link in search engine result that had been shared in Google+ network. Facebook is for traffic, but does not help much to find in Google search engine result.
Both are best from their own point of view. But the thing is which one would be more beneficial for business. And I think though Facebook is ruling out all other right now but Google+ plus would do the same a few years later. So stick with Facebook now and prepare for Google+ for the future.
Now Facebook is more popular than Google +. But in future Google + will be more popular. So try to understand.
I personally am not a big fan of google... especially when they banned my adwords account out of the blue and have no reason when I call them...they are shady!
I actually like the UI of google+ WAY better than facebook, but it just doesn't have the reach and so I guess I'll have to stick with FB for now ...sigh...