Speedster has a different aspect ratio, thinner wing, more responsive and faster.
The riser system has huge trimmers and a 50/50 split on acceleration.
The trimmers give 12kmh and the accelerator gives 12kmh.
Ozone recommend the Speedster as the next wing after gaining experience on the roadster.
Personally I found the speedster to be great at everything except being speedy, I was 80kg on a 22m so upper middle on weight range.
Id like to add that when moving toward more performance please follow the guidance in the manual.
High performance wings are more likely to collapse for example when accelerated with brakes applied.
No throttle required on Moster, had from new, over 50 hrs, never needed throttle on startup.