Facebook Updates all their iOS Apps, Android Apps still the same

After the major update for their iOS App, Facebook updated all its iOS Apps on the iTunes Store including (Facebook Camera, Messenger, Page Manager).

The Update brings more stable versions of the App with faster browsing & sharing just like the New Facebook App that focus on the performance. Unlike Facebook for android which is "SUCKS!" compared to the iOS App according to the android users reviews on Google Play store. Why facebook take care of iOS users over android users ?