Milanos are not even the best step up from dice chips, and the worst of the china clays, imo (also why they are the least expensive cc option).
China clays are not compression-molded clay chips -- they are injection-molded plastic with additives (silicates and carbonates) and cheap laminated adhesive-backed labels, trying to emulate the chalky-like feel and inlay of a clay chip.
BRPro, ABC, and NJ chips are now all made by the same company (ABC), but the NJ chips are made using different (textured) blanks. They also offer genuine Chipco blanks for a premium.