Even though the Android Market cannot compete (yet)with Apple's amazing 150,000 apps in the AppStore, the "war" between those two platforms continues.
Here's an interesting chart showing the difference between the type of apps per each mobile OS:
OS comes for free, cheapest devices, more free apps – if you are broke – get yourself a new Android phone!
(Which I did. I'm now using a Nexus One and still learning it. Expect a full collection of reviews very soon!).