Why? The market is big, so you'll find lot of games, in my opinion better than Android. You can also run Nook and Kindle app on it.
The iPad is a more mature tablet, stable and awesome performance. Also, most banks, newspapers, business, are designing or designed apps for iOs /iPad.
I just bought a Kindle Fire but is only good if you want portability or are in a tight budget. Is a different device with a great price, but not the best tablet out there, its not an iPad
I also like the Samsung 10" or 9˝. Those are lighter and faster than Xoom, in my opinion.