I prefer the less cluttered interface of G+ and the control over how much you share and with whom you share it. Also, I would say that I find FB is the place for talking to people you already know, where as G+ is more for connecting with new people.
I guess if you like FB there is no point in yet another social networking site. For me, I have never really liked FB and it's clunky interface so I find that I put the effort in to G+ now and just pop on to FB when I need to talk to someone who is only on there.
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