no difference,both fully programmable. 2 map you can just switch between 2 maps ,as it says .
2 stage does not come with 250 maps though they need to be installed.
interesting topic,
i have ridden 4rts since they came out and have stalled two or three times only . i have tried all options inc low tickover and low gearing . what gear is your dad using? 90% of sections are 1st for me
