Excellent clarifying article from John Gruber excellently summed up here:
The differences between the iOS App Store and Android Market are a microcosm of the differences between Apple and Google. Apple is a retailer, a purveyor of well-crafted goods that people will line up to purchase. Google is an advertising company that builds popular services that command large audiences.
Highly recommend you read it.
While he may end up being wrong about the benefit of huge market share which Android will get, he’s absolutely right that Fred Wilson is incorrect about the benefits of App developers choosing Android over the iOS ecosystem.