Which do you like best?

It is a "roll control". It allows you to lock your front brakes by using a electric valve. You can then preload your converter and the car will launch much harder.....when the lights come down, you release the line lock and the car takes off.

You can also use it in a 4 speed car for different purposes.
It will serve the purpose of keeping you on the line and not rolling through it while you wait for the lights to come down.
You can slightly depress the brake and engage the line lock to do your burnout. When you want to burn on out of the burnout area, you can release the line lock.