-- Last Updated: Jun-12-13 9:17 AM EST --
In the cave rescue manual "Life on a Line", the authors say that their experience has been that ascenders are more reliable than Prusiks when the rope is wet & muddy.
In my swiftwater rescue training I've used Prusiks on clean wet ropes without a problem.
Other considerations would be the risk of shock loading, and the consequences of the different failure modes.
As with so many things, I suspect the answer is to know how your gear performs in realistic conditions.
Kayak Motor Kit
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