iOS is still leading when it comes to game revenue. The chart below is awkwardly designed, because 100 is the iOS revenue from Q4 2012 rather than using actual revenue amount totals, which would make far more sense. But, it does show that iOS more than doubled in the past year; and in Q4 of 2013, Google Play generated about 1.25 times what iOS pulled in for Q4 2012. Google Play almost made as much as handheld gaming consoles like the Nintendo 3DS/2DS and Sony PS Vita combined.
Overall, game revenue made up 75% of all consumer app spending for the quarter, which just serves to prove our original point. As you might expect, two of the biggest revenue generators were the same for both platforms with Candy Crush and Puzzle & Dragons, though rounding out the top three for iOS was Clash of Clans, and on Google Play it was Monster Taming for Kaoko, which is a Korean title.
source: The Next Web