Turf tiger is the best in my opinion. I demoed a 61" with the liquid cooled efi kawasaki. It was pretty awesome. Can't tell you anything about a ferris. I have used scag since 1996, I will not buy a different brand of mower.
Bailey Lawn Service of Tulsa
61" turf tiger with kohler efi
36" scag v-ride
Shindaiwa t-270, eb-630
Scag giant vac w/ 18 hp vanguard