Forum Moderators: martinibuster
I think he didn't mean the adslot but the specific ad the was served to the clicker.
I don't think it matters either way.
Even if you put three AdSense "buttons" on a page that display one ad each and number those ads Channel 1, Channel 2, etc., and after a month Channel 2 seems to be performing best, that doesn't necessarily indicate that Channel 2 is your best display to keep. There are just too many variables.
dulldull: The answer is you can't tell. You have to trust AdSense to put the best ads on your site when each visitor visits. If you don't trust AdSense to do this, the only option is to replace AdSense with something else.
FarmBoy
In addition to channel tracking, a comprehensive and enlightening solution is CrazyEgg, a popular stats program that shows you where your visitors are clicking. It should be in the toolbox of every AdSense publisher that cares about usability issues.
I'm a proponent of cultivating the habit of looking at statistics of what users are doing on our sites, where they came from, why they visited our sites, what outbound links are popular, and other stats. In my opinion, becoming knowledgeable about your site visitors is of importance.
Mike