I'd love to see a comparison of ad-supported free applications. iPhone will surely win, but nowhere by that margin.

Also, one of the points of the article is that Android allows for more varied apps to be developed. GOTO (as described in the article) cannot exist on the iPhone. Nor can Swype. Nor any of the the home screen replacements.

Indeed about half of the app ideas I have are not possible to implement on non-jailbroken iPhones.