For banner ads, AdMob does about double what we do on iAds on a daily basis. For reference our user base is heavily weighted towards North America, Europe, and Australasia though, so we are seeing good results for iAds which have limited coverage. If we didn't, the revenue benefit for AdMob would probably be higher i.e. if a developer has a big user base outside these territories they'd probably see a better result from adding AdMob.
As well as banners, we are also using interstitial ads through via providers such as AdMob and Tremor. These make up the bulk of our advertising revenues.
Great info, thanks!
You guys made MAMC ?! Awesome game !! Keep it up