The earlier research only factored in new app additions. But new analysis by AppsFire shows that the Android Market has an attrition rate twice that of the App Store. Of the 300,000 apps published in the Android Market, 32% of those have since been removed. But of the App Store's 500,000 total apps, only 16% have been removed.
So why is this the case? AppsFire says that Android developers might have a harder time monetizing their apps, or it becomes unprofitable to try and maintain them. The Android Market also has an easier process, as well as no $100 development fee. App Store additions, on the whole, tend to be more carefully brought to market.
GigaOM suggests that the Android Market is a better venue for experimentation, while the App Store is better for making money. And we tend to agree. The only downside to Android's openness is that it lends to many under-thought apps, and less quality/security vetting.
source: AppsFire via GigaOM