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I would say that if you want the most cutting/slicing performance, then the Spydie with M390 will be it.
If you want almost as good cutting performance, but a bit tougher all around, then the ZT with Elmax is it...I think that in feature-by-feature comparison, the ZT wins, unless the over-riding factor is the superior slicing performance of the M390 blade on the Spydie.