Windows Phone has been top of the charts when it comes to advertisement CTR (click-through rate) for some time. Smaato has provided Q3 data and the trend remains the same with Windows Phone heading the way and Symbian close behind. iOS has moved from 3rd to 4th place however, with RIM moving up. This is comparing numbers and placement with Q1 data.
While the average user may not understand nor care for CTR, for developers it's key when using advertising over app purchases for revenue. The question of CPM or upfront payments has always been a tricky one to answer, but should your app be popular with adverts being displayed, the above data would suggest you should rake in some clicks. Interesting to see Android still trailing behind.