The Spyderco Sharpmaker has two angles, 40 degrees inclusive, or 20 degrees per side and 30 degrees inclusive, or 15 degrees per side. The GATCO is 25 degrees inclusive, or 12.5 degrees per side. The latter is "adjustable" as it is NOT a Vee style sharpener, despite initial appearances, it is designed to be used much like the Spyderco Sharpmaker and you can vary that as needed with a little practice.