I prefer the TSP ball, the Nittaku Japan ball is also hard and round. I also played with Tibhar, Joola, Yasaka, Banco and Butterfly, but TSP and Nittaku are better.
However, I agree that the difference is not as big as at the beginning. Contrarily to this evolution, the training balls - especially double circle - are still really horrible soft eggs, which was not the case for the 38mm-balls.
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