The Freedom Z has its own deck and does not use the Velocity deck like the rest of Scag's line as has been stated above. That said it seems to perform well. The Freedom Z also sits lower than the Hustler which you may or may not like. Between the two I would go with the one that has the best dealer support in your area. Both are good brands.
Scag Tiger Cat 48-inch deck, Kawasaki motor
Lawnboy 10227 2T push mower
Stihl BG86 handheld blower
Stihl BR550 backpack blower
Stihl KM110R kombi system with lots of attachments
Stihl HS45 hedge trimmer 24-inch blades
Echo SRM210 trimmer