Not a toss up if you are cutting rough properties day in day out, the difference is quite dramatic. Which is not just something you would experience if you demoed the both on the same rough terrain, jumping from one machine to the next. It proves itself in theory as well, just look at the 4 shocks on each wheel.
Try imagine driving your truck or car over a series of ruts. Then imagine taking out the shocks and fixing the wheels to the car like a non-susp ZTR. Maybe give your car or truck a susp seat for shits and giggles.
If you can imagine the difference between those scenarios, then that's almost the same as the difference between a non susp ZTR and a Ferris.