I have already read several post about all of these units, but I am still having a hard time picking one. I just picked up 2 apartment complexes and I am going to need a bigger mower than the one I got now 36" Walk behind. I am looking at a 52" One of the apartment complexes has a open area of 79,000 square feet. I have narrowed my choices to Exmark, and John Deere. I am just having a hard time deciding on a large walk behind and a Z. Most importantly if the walk behind should be a Belt, or Hydro driven. I know in the end this is going to be strictly my choice, but any help, or advice would be greatly appreciated. Thanks!