Material, feeding, knife condition, screens and downstream conveying all influence granulation. Record the operating conditions when discussing efficiency instead of comparing a single parameter.
Knife design and maintenance
Knife type, material, clearance and edge condition affect cutting. Inspect wear and fasteners as specified, and plan maintenance around the material being processed.

Maintain a suitable feed rate
Excessive feeding can increase load, while intermittent feeding can reduce utilisation. Organise feeding around the opening, material size and controls, within the equipment limits.
Match screens to output requirements
Aperture size, open area and cleaning frequency affect discharge. Establish the downstream size requirement, then use representative material to select a screen.
Compare under similar conditions
Throughput and energy comparisons should identify resin, dimensions, moisture, equipment configuration and measurement method. Base conclusions on records from those conditions.