Note that this data is by no means undisputed. It does not come from Apple and Google but from various analytics services with unclear coverage:
1. Do these numbers include ad revenue?
2. Do these numbers include music, magazine and movie sales?
3. Do the Android number include Amazon and the Chinese stores?
4. Do the Apple numbers include desktop apps?
5. Do the Google numbers include chrome extensions?
6. Do Google numbers include third party services such as spotify and netflix? (from the article, the Apple numbers seem to do that)
7. Do Google numbers include hardware sales (via the Play store)?
With that said, both stores are showing extreme growth so neither is a dead end and you will be happy which ever you choose:
http://www.gsmarena.com/google_play_app_revenue_up_82_in_q4_...