Compare them and weigh them up against each other?
konosuke hd or gesshin ginga?
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Are you talking the white #2 Gesshin Ginga or stainless? The HD is semistainless it won't get you a cool looking patina, just some hazy colored stain. The carbon ginga would get a patina and the stainless is, well, stainless.
Both are lasers and I'm sure you'll get great cutting performance either way. Someone mentioned better fit and finish on Ginga, not that konosuke fit and finish is a slouch.
I don't like ho wood handles. I know konosuke has some ebony handle options and others, but usually out of stock. You could order direct from them and get whatever handle you want. JKI sells a few different rehandles, I like ichii or burnt chestnut better than ho wood by far.