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Chinese "pimple-in" rubbers are usually made of 2 layers (additional coating / finishing) of mostly natural rubber, so they are more durable and with much higher friction for spin. Drawback is theya re heavier.

Japanese rubbers are based on mixture of rubber and plastic / man-made rubber, with more rubber. So they are reasonably durable (not as much as Chinese ones) with less friction for spin.

German rubbers are usually made on high content of plastic, so they "sound" better, with higher speed / bounce, but much less spinny, and easier to crack, especially they are usually made from a single layer.