Two 336x280 units overfold

I have two large units one next to the other,under the post title over the fold.The right unit performs much better than the one on the left,which contradicts the common belief that a large box under post title on the left performs the best.I cannot explain it.Maybe it is the ads they are displaying.What do you think?

 

Performs better in CTR and CPC?

Hard to say, let's say impossible, but could be many things.

 

Agree with Jamescolin here

 

It might be because of the site's language.Maybe results vary from country to country and language from language.

 

I would opt for 1 large ad block above the fold. Reason being that two ad blocks side-by-side look spammy despite the fact it is allowed.

 

By the way,what happened to the adsense ads in your 'shetoldme' site?They are gone.

 

Yes they are gone for now, and maybe for good, here's the reason:
http://www.best-reviewer.com/google-adsense-you-have-3-working-days-make-changes-your-site-7330.htm