I don't know Ed, my butt has always been honest with me
The problem here is that everyone is trying to look at just one factor, flywheel weight, that is part of a multi-factor relationship that is not universal and includes the drivers driving style and the intended use. At best we can make generalities, and maybe, just maybe, somebody might get it half right at best.
Of course, that should not stop anyone of us from opining from afar
Glen,
The rotating assembly with the flywheel will have to be balanced and should be a matched set, i.e., if you are using a lightened crank it probably makes more sense to use a lighter flywheel, whereas a standard weight crank might work best with a heavier flywheel.
Have a happy New Year.
Jim