You can choose to display either text ads or image / rich media ads for Google AdSense, or you could also chose to let Google display both types (which is the default, recommended option). Google will display whichever ads with the highest bid regardless of the type if you choose to display both types.

The default Google AdSense setting is to display both. Some people claim that text ads perform best while some has more success with image ads. Google’s advice however is to display both.

So, which type of AdSense ad unit should you use for your site?

As with other Google AdSense optimization tips, it all depends on the type of site you’re running. Also note that choosing the right ad type could complement to your site’s design. The following lists the pro and cons of each ad unit’s type.