A big question I get all the time is ‘why should you link your client’s adwords account to search console?‘ This is very a simple questions to answer.
When you link your clients AdWords account to search console you can see specific data that you normally wouldn’t see if they weren’t connected.
For the best tracking, you should connect all of your Google accounts. You should connect Google Analytics to Adwords, Analytics to Search Console, Adwords to Search Console and any other connection that you can make.
This way, all of the available data can be blended to get the best results and rich data that you can measure and learn from.