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The Best: most expensive (use better steels)
The worst: the cheapest (garbage steel)
This is very subjective. One of the best heat treaters is Bos in California IMO
I don't think price had anything to do with heat treating protocols and the end result.
In my experience, Buck and Japanese made Spydercos have had the best heat treats.
US made Spydercos, at least from my sampling, have seemed to be hit or miss, which is why I prefer Seki-made Spydercos to Golden knives.