I'm on both Google Plus and Diaspora and have found I prefer Diaspora due to privacy issues. I'm not sure people know much about Diaspora as the main stream media continues to pump out either Facebook or Google Plus as the only two choices we have for social networking (sadly)- of course both have been determined to be quite intrusive into your privacy as well.

There are also many people now being spooked away from Google Plus and its current policies. If they want to succeed and get the corner on Facebook then they should actually be the opposite of what everyone hates about Facebook! Doesn't look like that's happening though....