Still the facebook is best and Google plus has a better future. I think people will say another after 5 years as I can still remind what happened to Yahoo before Google enter.
It really depends on what is your reason for using those Social Networking Sites. But in overall, it's still Facebook.
I use: Facebook for time wasting, seeing pictures, commenting and stuff.. twitter for finding people that have same interests like you.. google+ to enhance my website social bookmarking level to increase the pagerank
So are you saying that Google+ has a better future based on the recent redesign? It's not like I'm the biggest Facebook fan, but now, it's even more of a pale imitation. Plus still offers no compelling reasons to use it instead of FB. Unless Facebook does something to cause its massive user base to leave and try something else, Google+ is never going ever be a serious competitor to FB. Of course, Google+ seems to be a failed project that they should pull the plug on and just fix their search engine...but the company must be crying with the near $3 billion it made in profit last quarter!
I don't think that G+ is actually better than Facebook right now, but I believe it has greater potential, because (I'm sure) it will have an enormous impact on SE positions.