I got a very interesting question in my inbox today. The question is – AdSense offers two rectangle ad units – 300Ã—250 and 336Ã—280. Which one is better? Also many people recommend 336Ã—280 but I see most of them use 300Ã—250 and I see the same on your forums/blogs.
It is a very tricky question where he is not only asking me why I am using an ad unit that is not best recommended by others.
I will answer this question in two parts but before we begin let us see the Adsense Rectangles first.
Adsense does not offer two rectangle ad units but actually they offer three rectangular ad units.
Coming back to the original question –
Which Adsense Rectangle Ad Unit performs better?
As a general feeling we may think that the larger the ad space the better it’s earnings will be and this is the main reason why some people suggests 336Ã—280 over 300×250 but 300×250 is much more popular among advertiser’s and especially among the CPM ad networks. In Adsense you can opt for Google certified CPM Ad network ads and so if you have 300×250 it may actually have more advertiser’s to compete for an ad view giving you higher return. So instead of going with what I say is best, test both as there’s a good reason why the smaller ad unit can perform better for you and vice versa.
The other part of your question is –
Why I use 300×250 more than 336×280?
Adsense is not the only Ad network I use. The other network prefers 300×250. It is one of the main reason I prefer 300×250 ad units more than 336×280. Apart from that I personally like 300×250 integrated into the design more than 336×280 because later looks less professional to me.
How about sharing your best performing Adsense rectangle?
Further Reading …