On the scooter with the short gearings, the clutch will work (slip) less time. This means that less energy of the engine will be consumed by the clutch.
(Example) If two scooters which are equally tuned except for the gearings would drag race;
Both scooters kick the gas same time.
The clutch begins to work and the scooters begin to accelerate. The first few meters they are side to side.
It's (example) 10km/h. On the scooter with the short gearings the clutch end it's work. At this point it's engine goes into the real powerband rpm, and the clutch does not consume any more power. While the scoot with the longer gears has the clutch still working. So the scooter with the short gears blasts some meters in front of the other scoot.
It's 20km/h, when the clutch of the other scoot finishes it's work, happens the same what happened to the scoot with the short gears.
Now on both scooters the variators are expanding the belt and regulating the transmission. On the scoot with the shorter gears, the variator expands faster, but both scoots mantain the same powerband rpm, and the torque transmitted to the rear wheel is the same. It has to be, by the law of the conservation of energy. This means that they accelerate the same. However the second scoot is some meters back.
Lets say at 100Km/h the variator of the short gear scoot comes to the end of it's range. Because of this the overal transmission ratio becomes fixed, this means that to gain speed it should increase the revs. So it usually does, but this way the engine goes overrev, where it looses power, so the scoot stops accelerating.
While on the scoot with the long gears the vario is still working to mantain the engine at it's max power.
If the scoot stops gaining speed and the engine isn't in overrev, it means that all the power possible is used to fight the aerodinamyc and rolling drag force. On a perfectly tuned scoot this would happen just before the variator has ended it's range.
Of course there are some other things that are and may happen during the work of the transmission system, but it's the work of a good tuner that has to take out much performance possible from the engine by setting it up properly.
So the setup and quality of the clutch on an long gear scoot engine is much more important.
I hope I was understandable