Ok, I am going to go out on a limp here. Background, I have tried H3 (my main rubber), Sanwei Target National, Big Dipper, AK 47 blue, CJ8000, Sanwei T88 Ultra Spin and Battle II provincial blue sponge and Mercury II.
Mercury II is dirt cheap. Like 1/3 of a price of H3 neo and 1/4 of the price...