I agree with the H-1 steel by Spyderco. I have a salt H-1 serrated and like it very much. It has aggresive serrations and will easily rip/cut through rope. Another thing I like about the Salt with serrated blade is... it still has aprox 3/4" of straight blade at the tip for fine work.
Dread
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"Do what you can, with what you have, where you are" : Theodore Roosevelt c.1899