I prefer G+, but the onboarding - actually getting disparate folks easily invited and notified has been inscrutably hard. Part of the prob is that I have multiple gmail accts and address books as do the folks I'm inviting, but another prob seems to be the less than ideal invite workflow. When Goog gets calendars, gmail, docs and hangouts well integrated, Skype will have a serious threat on its hands.
My invite workflow is "Skype everybody the G+ URL"... If they could make a better workflow that'd be great. Maybe they could stop tripping over their feet trying to make everything social and just make this workflow make more sense!