Having owned a full suspension Ferris ZTR, I can also say its ride is exceptional.
BUT....it has an utterly amazing number of zerks to grease and if you don't get the ones hidden
in difficult places, as my previously owned unit had not, replacement of locked up suspension pieces is
pretty expensive. Never owned a Ferrari but that high maintenance high power mower reminded me of one.
So how much maintenance are you willing to do? A good suspension seat is nice and requires almost zero maintenance, but it is NOT the same as a full suspension mower. I have a JD X750 now due to arthritis and while its optional Michigan seat is seriously comfortable, I have always wondered what it would ride like with some tiny
Bilstein shocks on it...
Advertised top speeds are nonsense except perhaps for mowing ball fields. Real world with obstacles and lawn hazards
you drive a lot slower. If I were mowing more than five hours a week, I'd go diesel based on fuel burn. Those high hp gas motors are wonderful but they do suck gas. EFI is likely worth the extra cost if offered.
Likely the OP would be quite well served by either the commercial Bad Boy or the Scag.
For comfort an optional or aftermarket seat is a must.
Set a budget and buy from the most convenient, friendliest dealer.
And make sure a 62-72 inch wide mower really will fit in or through the places you need it to.
Most convenient mower design I have ever seen are the front mount mowers like the expensive JD and Kubota models.
$20K lawn mowers but they can lift their mowers up and out so blade changing is remarkably easy. And they trim exceptionally well, very maneuverable. These are the mowers you look for used that are relatively low hour, if you can find them, likely diesel, and are reasonable alternatives used to the new mowers you are looking at. So the previous suggestion to also consider used if you find a real bargain nearby gets my nod too.