F units are incredible, they give very close to the speed and maneuverability of a Z .
But the versatility to do so much more.
You can use mutiple mower types on them.
Reel, rotary, flail, brush, sickle.
And mutiple other attachments,
Snow blower
Broom
Blade
Leaf blower
Grass / leave collector
Land plane
Rubber broom
Grader blade
Just think of a B backwards on steroids and a really fast PTO.
If you have a lot of lawn a lot of trees, or a lot of small spaces and obstacles a tractor with a mower deck will leave you disliking it in a quick hurry.
Even with the loader off it's still no where close to the maneuverability of a Z.
Now if you have a normal amount to cut, not a lot of low hanging trees and a fairly wide open plan then you'll probably love it.
For me I have a lot to mow, 3+ acres with all sorts of obstacles, 100's of trees to run under and around, so going from a ride on mower to a Zero turn was a huge game changer.
I still have a brush hog and a flail to do the rougher sections from time to time.