Mr Browns property is for the most part wide open. you could mow his property with anything.
For some of us we need more manueverablility and the AWS makes a big difference. This is where the Deere 700 series really proves its worth in manuevering through the trees and obstacles. For my work reducing the hand labor to a minimum is very important and noteworthy, that is why I bought the X749. So far it is making alot of difference in the hand labor and just on the current job has reduced the extra help needed by 50 hrs roughly. That makes my ROI look good.
Most of us working stiffs can't buy one of everything, so we have to make choices that allow the machines to overlap in size and function getting the most bang for the buck. In most cases I have found I can get close enough using the 110tlb and 4520 (without a fel) that the cleanup is easily done with the X749. This is working for me but others may choose to buy a 2X20 series or 3x20 series instead and buy a smaller mower and maybe a larger 5000 series tractor for open areas. Alot depends on your own circumstances.