Quote from thenerdal
Let me rephrase that. iOS has more apps and have better quality apps.
According to wiki (which I take with a grain of salt)
May 2012 Google play has 500,000 apps
March 7 2012 App store has 585,000 apps.
Im sure both stores have gained more apps. But the difference is negligible in terms of who has more apps.
October 4 2011 app store had 500,000 apps
October 2011 Google play had 319,000 apps
App store has gained 85k apps since October
Google has gained 181k apps since October
The rate of expansion says android app store will soon have more apps than IOS