They're essentially the same design, probably different materials, not sure off the top of my head but cheapest ones probably don't have ceramic pistons, pads they ship with are different but can all use the same ones.
@snottyotter started
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They're essentially the same design, probably different materials, not sure off the top of my head but cheapest ones probably don't have ceramic pistons, pads they ship with are different but can all use the same ones.