There's a slide in here which shows apple has ten times the app download revenues that android has:
http://www.businessinsider.com/state-of-internet-slides-2012...
And mobile web usage isn't looking much better for Android: http://www.businessinsider.com/apple-android-mobile-web-usag...
No doubt more and more phones in pockets will be running Android. But how many will really be used like smart phones?
To be more exact, this is the perspective of a developer looking to monetize their application by selling directly to users.