Why Google+ is not another Buzz ?
Google+ integrates social services such as Google Profiles and Google Buzz, and introduces new services Circles, Hangouts, Sparks, and Huddles.
Google+ is not another ‘Buzz’ as it’s not trying to convince users to share stuff. Instead, it’s facilitating users with remarkable features such as Instant Upload(that auto-uploads all photos & videos taken from your phone to your Google+ album), thereby causing convenience and creating right environment for sharing.
With Hangout and Huddle, Google is trying to make online socializing more real-life and fun, unlike buzz that was hardly fun for anyone.
Besides Buzz is in Gmail , unlike Google+ is a full social media website.
Google+ is now compared to Facebook.
Google has announced that Google+ had reached 10 million users just two weeks after it was launched in a "limited" testing phase.
After 3 weeks in operation, it had reached 20 million users.
Just about yesterday Google+ has hit 25 million visitors, this is also a proof that Google+ isn't a usual buzz.
Is there an advantage to use both ?
In my opinion, No. Since Google+ has all the features and more that was bulit in Google Buzz, I also heard a rumour that it will be closed.