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It's a moot point as the particle shapes & their action are completely different for all these hones. The Shaptons cut small grooves into the steel whereas J-Nats work more like a wood plane...

Actually... What is missing from your collection is lower grits for bevel setting. A J-Nat is not the most efficient way to set bevels but if you want an alternative to your Shapton 30k then yes a...

Your question is which brand is best ? but you only give one "brand" ie #2
Hatanaka san's stones are highly respected as a brand because of their general quality the others are not a brand. Even so...