I don't know if this is in time or of value to you but, I operate two Tiger Cat Scags and a ZG222 Kubota commercially. I traded in a Kubota ZD326 last year. FOR MY OPERATION, I have not found a mower that touches the Tiger Cat Scag with a 52" deck. I cut small properties, and I cut at times upward of 20 acres in one day.
I have had excellent experience with the Kawasaki motors.
The Velocity deck is incredible especially if you cut stemmed grass like we have in South Alabama. Bahia grass in July and August is tough stuff.
I have had good success with my ZG222 Kubota but it WILL NOT cut grass with the quality of the Scag. The ZD 326 Diesel would not either or the one I ran would not. I have talked to numerous other operators that say the same thing for them. Others swear by them.
I am not sure of the difference in price of the Freedom Z or the Tiger Cat but I know that the Tiger Cat is one tough little mower.
I have a friend that has a Tiger Cub also that is 19 years old that he uses for his personal use and it is running great after all of those years. He could easily run it several more.
The advantages of the Scag over the Kubota are several in my opinion. Blade change is easier.
I have one with about 800 hours on it and one with about 650 or so hours on it and they have been incredibly reliable. Scag is one great mower.