When developers talk about which mobile platforms they plan to support (the choices being: iOS, Android, Mobile Web / HTML5, WinMo7, J2ME/BB, Symbian), I never hear people talk about retention as a motivating factor. The decision factors are always: distribution, addressable audience, ability to convert paying users, ease of development, beauty of the underlying devices, and biz dev deals (ie getting paid by a platform owner to support an inferior platform).
I’ve never heard user retention cited. But this chart is quite powerful, and going forward will be one of the top 2-3 reasons why any developer should support iOS first and foremost.
(via Users more loyal to apps in 2012; iOS beats Android | Localytics)