AdSense Ad Sizes
AdSense Ad Size DOES mater. Adsense offers you many ads size options but from my experience i can say, the large renctangle 336 x 280 had the most clicks ( you can track your ads and click by using channels ). 336×280 ads blend with any content very well. If you are looking to place ads in your website’s sidebars, you can choose from 160 x 600 (Wide Skyscraper), 120 x 600 (Skyscraper), and 120 x 240 (Vertical Banner).