Welcome to WebmasterWorld Guest from 18.104.22.168
joined:Oct 29, 2013
In almost all cases, the 336x280 will perform better
Our system will look at all 300x250 and 336x280 ads when it runs the auctions, so if the 300x250 will perform better, we'll show that slightly smaller ad in the larger ad unit.
joined:May 7, 2013