Clearly angry birds is making money on both platforms.
I think this interview may be interesting, given the reference to Angry Birds in particular:
Peter Vesterbacka, Maker of Angry Birds Talks about the Birds, Apple, Android, Nokia, and Palm/HP
9. Why did you decide to make the Android version free and is that going to change any time soon?
“Free is the way to go with Android. Nobody has been successful selling content on Android. We will offer a way to remove the ads by paying for the app, but we don’t expect that to be a huge revenue stream.”
Note: that article is something like two months old now, things may have changed since then for them.
Personally, I prefer the instant feedback when scrolling. I generally feel like I'm moving a physical object when scrolling on an iOS device, whereas with Android, I feel like I'm using a gesture UI. There's nothing wrong with either--it's personal preference.
I've thought about this exactly, that apple does a great job of making their devices seem physical instead of virtual. (Please excuse the handwavy language.)
One can call it personal preference, but in reality I think a lot of people's preferences lean that way because it's ingrained in their heads. When they move an object with their finger, certain basal parts of the brain expect that object to react in a smooth, predictable manner, and this is decoupled from the expectation of the information they want to see scrawled on the object (the webpage). This was important even back in keyboard and mouse days (old linux window managers would give an option to just show an empty rectangle when you dragged a window so that the movement and placement was smooth), but now we're literally pushing things around like they're representations of the physical world.
And it's a hell of a lot nicer to use a device that agrees with built-in models of reality. I dunno if apple has patented that very idea or what, but it's all over iOS and conspicuously absent in Android. Fluid screen rotation, resistance to overscroll and springback, acceleration and deceleration of page flipping and scrolling... and simple framerate (though the Droid 2 is admittedly getting a lot closer in that last regard).
How the hell am I supposed to wrap a fish in that?
I've found that my iPad makes an excellent sushi plate.
Solutions are obvious if one only has the optical power to observe them over the horizon. -- K.A. Arsdall