You <i>really</i> want a survey of some folks who have released similar apps on multiple platforms, and to cover the development-cost and revenue sides, including in-app purchase and any ad revenue, if that's a substantial source for anyone.<p>Just comparing aggregates, it's hard to tell what differences are thanks to the platform and what's simply because "the average app" on Android is different from "the average app" on iOS (because of review, barriers to entry, etc.). And there's nothing about costs.<p>Much as I like Android, I bet iOS tends to be the better deal for paid-app developers right now. You have fewer devices to target and no equivalent of Android's Gingerbread situation. ("The Gingerbread Situation" is also a new punk band I'm forming, BTW.) And Apple customers seem to skew a little spendier, though maybe that's changing.