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Coticules act a lot different then Jnats so it is very bad comparison.
In general i will say harder Jnats give better edge on razors, but of course there are exceptions.
Lets say it like that,...

For razors we ussealy talk about polishing stones and only final polish, not realy sharpening !!
Thats why i like coticules a lot they sharpen and polish very greate and i use them a lot my self,...

Yep i think too that there are different prefferents on the edge, coticule is a lot coarser then a Jnat but still shave very nice and sometime better, the hybrid coticule that i have is a lot harder...