There have been many reports talking about how Android or is more popular than iOS and vice versa. However, if you’re a developer and want to make money, you should be on iOS.

[ad#Google Adsense 300×250 in story]Citing a report from research firm Distimo on Friday, Fortune’s Philip Elmer-DeWitt shared some interesting statistics. For instance, out of of 72,000 paid apps in Google’s Android Market, only two have sold more than 50,000 copies.

Wow, that seems incredible. Consider this: On Monday, The Heist launched on iOS and sold over 25,000 apps in half a day. Of course, we’ve all heard about apps that have been downloaded a lot more than that, but if you’re a developer, that number has to scream at you.

Here are a couple of other interesting points from the report (there are more at Fortune):

• Looking at paid applications in the Google Android Market, downloads are significantly lower than they are for free applications. The percentage of all free applications that have been downloaded less than 100 times is 24.8%, and the percentage of paid applications that have been downloaded less than 100 times worldwide is 79.3%.
• In March and April together, six paid applications have generated more than 500,000 downloads each in just the United States in the Apple App Store for iPhone. In the Google Android Market however, only two paid applications have exceeded more than 500,000 downloads (but under 1 million) worldwide to date