Here is an Article that's pretty interesting.
In another forum, some people said that their apps were selling better on the Palm Pre than on the Android.
http://techcrunch.com/2011/02/21/861-5-percent-growth-android-puny/ (http://techcrunch.com/2011/02/21/861-5-percent-growth-android-puny/)
http://tech.fortune.cnn.com/2011/05/27/why-its-harder-to-make-money-on-android-than-on-apples-ios/?section=magazines_fortune (http://tech.fortune.cnn.com/2011/05/27/why-its-harder-to-make-money-on-android-than-on-apples-ios/?section=magazines_fortune)
Regarding the 2 apps I have on both iOS and Palm, I can say Palm has better first-week sales, but reduce speed faster than iOS ones.
But my apps are crap, so...