[SmokeyJ]

The advantage comes from lower startup inertia, and the most noticeable differences come generally in applications such as pitching and flipping where you are not imparting a lot of energy to the lure to make the cast. A wiffle spool generally is not only lighter in and of itself, but holds less line, further reducing the weight of the spool/line assembly. It's all about Newton's first law, an object at rest tends to stay it rest. The greater the mass of the object at rest, the greater the energy necessary to overcome the inertia.

So you are throwing crank baits; a wiffle spool would make sense with smaller, lighter baits because you will get a bit more distance with the lighter weight of the spool bringing the spool up to speed more quickly. If you are throwing larger, heavier baits I doubt you would see a major improvement in distances, but I imagine there would be some. Also, if you have the brakes cranked up and the spool tension loaded up, I think the differences between the different spool types would be negligible.