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Sugoi. The longer one in the straight sheath.
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I agree I have both the Sugoi and zubat. I have the shorter Sugoi and have modified for my personal needs, it was just too long for the trees here which have very dense canopies and would get hung up in other branches when cutting. It is now exactly 13" like the zubat which I reshaped the tip. Did not like the vine cutting stub on either saw, I just hold vines and cut, much faster. That being said the zubat has very aggressive teeth for bigger stuff but is not hardened, therefore dulls faster and needs changing more frequently. I have yet to change mine after a year of moderate use. The zubat is for smaller stuff where more precise cutting is required due to it more teeth per inch. It has a hardened blade and is very durable. Clean after use and they last. Hope this helps. There is an attached picture to show the slight mods. Paul.