240 white #2 (59/60 HRC)
Gesshin 180 stainless (61 HRC)
180 wa stainless (59/60 HRC)
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Honestly both steels are great, no wrong choices. The carbon is quite reactive at first but once you start building a patina it calms down. A joy to sharpen and gets stinky sharp. Edge retention is decent, as expected for a Sakai white around this hardness, but not an issue for a home cook like me.
The stainless, specially the Gesshin, is one of the best I have tried. Sharpening is enjoyable (specially on Gesshin soakers) and has a little bit better edge retention vs. the carbon. Also gets a bit less sharp, but still on the top tier sharpness for Japanese stainless.
I got the 180 first and liked it to much that I bought the 240. I like the extra heft the yo-handle gives to an otherwise light blade. Balances nicely ~1cm from the heel.
The grind is the star here IMO. Miles away from more common boring monosteel grinds (ie Misono). A gentle and continuous convex from spine to heel that makes it feel more robust on the board compared to other monosteel lasers. Compared to Kochi, it’s a hair or two thicker BTE - that and the lower HRC makes it more resistant, but due to grind and overall thinness it still cuts super smoothly.
Gesshin version has higher HRC, polished spine and choil and JKI’s QC for a fair premium. Also I’m happy to give Jon & crew my money. But really the regular version is already great. Again, no wrong choices