Msg#: 4556884 posted 8:55 pm on Mar 20, 2013 (gmt 0)
The bottom line isn't rankings, but rather how much Google organic traffic is the site getting. In many cases you can check traffic for specific keywords as well as countries of origin. Traffic data includes the effects of all the factors such as personalization, different data centers, localization etc. and therefore gives a better overall measure of how the site is performing in the Google organic rankings than anything else.