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I find that different markets perform differently within the separate networks. In terms of impressions, I would say that all depends on if you are using google's search network and content network. These are the partnered sites. These will give a LOT of extra impressions, and sometimes even fake clicks from people trying to build their own accounts.
I personally do not ever take part in the content choice, and only use the partner search network on some specific terms.
I think this all has to weigh in of impression counts. As you can imagine, these 2 choices alone will skew the results by a lot.
KG