Our list consists mostly of conical-burr grinders. In a conical grinder, coffee beans are crushed and ground between two rings of burrs. They deliver a finer, much more consistent grind than you’d get with a traditional blade grinder, even the nicest ones.
Flat-burr grinders are similar, but they’re typically more expensive. In these, the burrs are laid on top of each other, and the beans pass through them as they grind. The grinder action pushes the grounds out of one end, instead of relying on gravity like a conical-burr grinder, and the beans spend more time in contact with the burrs. This results in a more consistent grind, but for
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