I think so much of the question hinges on just what you're fishing for. In addition to the important advantages in retrieve speed, there is the criteria of start up inertia. Because the spool radius is in effect the lever arm the fish uses to start the spool turning (and the drag dragging), the large and very-large arbor designs allow for a smoother drag initiation, so they are progressively more desirable with fish that accelerate rapidly (and hard) to a higher speed. i.e. bones, tarpon, albies.