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This has been a good question and so far this is the only actual direct swap comparison i have found enjoy! Hope this can help everyone understand the advantages of a light flywheel.
The light-weight fly WILL spin up faster, but will require some additional feathering upon leaving the line. Once you are engaged, you WILL accelerate faster, all things being equal. As I am not into the 1/4 mile, I prefer the heavier fly as it tends to "smooth" things out in the drivetrain for DD rides.