Nielsen have released data showing that Apple is the biggest brand in mobile. 40% of smartphone subscribers in the USA are for an Apple device. Second is Samsung with 24% of the market. Does the battle of Apple vs Samsung matter or is it really iOS vs Android?
The same Nielsen data shows iOS is 40% vs Android at 52%, giving Android a clear lead. This is a misleading stat. If you check out the Android developer site it shows that from all Android devices version 2.3 (released in 2010) is the largest with 33% (at time of writing). iOS has 93% running version 6 (the latest)
Why does anyone (apart from Google / Apple shareholders) care about these numbers?
When building an App or an mSite developers must test the product on their target devices which can be an expensive exercise depending how comprehensive the tests are for Android (different screen sizes, different Android OS, different manufacturers). The features and capabilities on the latest OS versions power a better user experience than the older OS release.
It is easier to launch a service or product targeting Apple iOS. The OS is not fragmented and the latest version is most popular. Marketing a product targeted at Apple users gives a business confidence all their customers will have a product that works and functions as the designers intended.
So Apple still being no 1 does matter. It is a sound strategy to target Apple first (if native app). After achieving success with iOS users migrate the app to Android. This is sound logic to reduce investment risk and avoid doing r&d work twice. It is a big win for Apple - it means the newest apps go to Apple iOS first!