John Carmack, the lead programmer and co-founder of id software:
You’re just not making money in the Android space as you are in the iOS space.
We made more money than people may expect on the Doom RPG stuff. It’s just fun to develop on iOS. We’d show people what we were working on and they’d go “Oh, when are you going to ship that?” And I’d say “next month” and they’d go “Aww, I wanna work on an iPhone title.” It’s hard to make a rational business decision to say I want to take resources from something else and put them on this. We did actually hire a person to be our Android guy, but it looks like he’s going to get stuck on iOS development!
Game development on Android is less fun and developers make less money, what’s the incentive of making games on Android? So if playing game is one of your primary goals to have a smartphone, stay away from Android.