No need to read any further, Dr. G has said it all.The difference lies not in the choice of material but the inner contours (chamber dimension and baffle) and the shape of the beak.
Buy one of each and see which one sucks less. :twisted:
The best modern "Otto Links" tend not to have "Otto Link" written on them. There are a host of people making Link-style mouthpieces in both STM and Tone Edge models that tend to play much better that the real thing.