Gear Ratios

I was wondering which gear ratio has been most effective for teams with a single wheel flywheel

7:1 seems to be the best the next one that is i saw was 6:1

Would you have a wheel of the same size on top going counterrotation to the one on the bottom, or just a freewheel? These are all things to consider. And if you’re running the flywheel launcher with one or two motors.