The downloads stat is no longer true[1]. Revenue is still much higher on iOS, but the trends have been clear, and cannot be ignored. Before, it was "Android is open, but there are way more iPhones", then it was "Android has more phones but iPhones get more downloads", it won't be long until revenue surpases it too.

[1] http://www.siliconbeat.com/2013/07/31/google-play-passes-app...

EDIT: More stats on revenue:

In nov 2012 the gap was 4x

http://www.startable.com/2012/11/

As of Q3 2013 the gap was 2x

http://www.gamesindustry.biz/articles/2013-11-03-google-play...

They're catching up, and fast.