Well I cant confirm if they are solid facts as you'd need a whole bunch of iOS/Android devs to share their income data, but for me, I've got around 10 apps on the iOS App Store, and only 4 apps on the Google Play Store.
On iOS some of my apps are paid, the free ones are iAd supported.
On Android, they are all paid.
If I take an example of one app that I've released on both app stores, they are both priced at $0.99 USD. The Android version gets more downloads (and thus makes more money).
Basically, for me I've found there to be a larger Android audience for the types of apps I make.
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It would be physically impossible for apple to simply 'download a copy of android' and 'copy across' the notifications. Apple had to make that from scratch, not copy code from Android. Obviously notification center is a blatant copy of the Android notification system, but there is no way in hell it will be using the same code.
I did not imply that. Obviously Apple needs to do a lot of coding on their own. That's why the new features show up in Samsung version of OS before they do in the Apple version