I'm a professional iOS game developer with a relatively popular game currently in the App Store. However, I'm an Android user.
In terms of revenue, Android may be catching up, but iOS will remain significantly more profitable for the forseeable future. Also, support for Android is a nightmare.
The emulator is powered by App.io, they've done some pretty awesome stuff! We've also been using Apportable to port our Cocos2d games over to Android and it works like a charm!
It would seem a android emulator is far easier to build but i may be wrong.
Edit: Cocos2d port Cocos2dx is also available for android.