I have not turned all the different ebonites from different countries.
German ebonite was the originator, it smells terrible (burning rubber) and is very difficult to get a scratch-free shine. I have turned German several times. I am told the Japanese has less odor and the Indian seems to be easy to work with, but I have been told there are voids in it, from time to time.
Good luck, expand your turning horizons!!!
Ed