The only good reason that I see is to have the hard buttons. The 900 controls up to 15 devices so it will control your equipment the same as the 1100 does. You can program any of the hard buttons to do any function so if you don't use the numbers on the keypad, you can program them to do something else. Even if you don't watch TV, I'm sure you press a lot keys like: volume, play, pause, forward, back, arrows when you go into your AVR Menu, etc..
In the end it's a matter of preference, I just prefer hard buttons and the way the 900 can be handled with one hand.
One thing to keep in mind is that if you switch to a different model, you're gonna have to reprogram most of the remote. When I went from a 720 to the One, it kept all my devices and activities but I had to reprogram the functions of each button.
