I agree with Gary in that you don't need a 60" ZTR on that size property. You can save yourself some money by going with 48" or 52".
Also, it's gonna all come down to personal preference and comfort, because, also like Gary said, they all use mostly the same components. The seating position, deck design, and paint/stickers are the main difference.
If I was buying again, I'd probably buy the Ferris for the ride comfort. Even though I have read and heard some complaints on the cut quality compared to others, I'd still want comfort.
Now, if YOUR yard is flat and smooth, then spending that money on their suspension is probably money wasted.
Good luck!