Club Norton - Norton security scan (Symantec security check) vs Norton 360 - what the difference

I logged  an issue with Norton Tech support via email and got the id # and generic message to keep my pc safe.. is to go the link - http://us.norton.com/clubsymantec/ that goes to Club Norton and under tools and support -Symantec Security Check -Test your computer’s exposure to a wide range of risks. when activated got the following message:

Download and install Norton Security Scan. It will automatically scan your computer every week, replacing the need for you to manually scan using Symantec Security Check. It’s quick, easy, and best of all, it’s free!

 

Is Norton 360 different from  Symantec security check or it is better than Norton 360

 

should I download Symantec security check  when I  have Norton 360 Premier Edition

 

Please update as I am confused... which is a better software(symantec or norton 360)

Thank You for all your help.

rao