All versions of the Razor E300 scooter have 250 Watt motors and controllers so there should not be a power or speed performance change between different versions.
There is a throttle and controller difference between version 1-19 and 20+. Version 1-19 has infinitely variable speed (0%-100%) control, while version 20+ has single speed (0% or 100%) control.
Leo Wang
What are the different parts and how does that affect the scooters performance