Right now, facebook has more features and favored by users, slowly Google+ is improving and adding new features. I won't be surprise if google+ beats facebook in the future. What i like about google+ is the circles feature easy drag and drop.
I think Google plus will be successful...mainly because of the all buzz this has created. FB contributed in this buzz by creating all the controversy. Will it be big enough take off FB, I don't think so.
Google plus has many followers so a site can earn free traffic just by following people related to niche of the webiste.
i like it and its features but i do not get enough time to use it.most of friend use facebook and facebook has become a means of communication for us.
I like to use Google+ same as Facebook because Google+ seems good design of like circles and few more options than in Facebook.