When it comes down to charging flywheels...It also depends on the engine setup, a more aggressive ported engine, a little low on compression or just a little big on the impeller pitch, the benefits will increase with a aftermarket aluminum flywheel. On engines that have stock porting, running over 185 lbs compression and propped just right or a little under for flatwater will not see as big of a difference.
If your going to stay with a charging system the TBM is a very good choice for a aftermarket charging flywheel, (when using a MSD Enhancer) with great gains in weight reduction.
A stock lightened flywheel is budget friendly though.
Chuck