Well I've used a Prusik and never laid eyes on an ascender, other than in a catalog. I trust a prusik and it is a neat looking knot.
I understand the function of the ascender and it seems like it would work okay. However, I'm thinking an ascender doesn't have a very big bite on the rope, z-drag may be subjected to multiple times the force of a person on a rope, and there may be potential to damage rope with an ascender.
This is all conjecture on my part. I only responded so Id get to type prusik and say it is a neat looking not. Prusik, prusik. Believe it because you read it on the internet!
Full Size Sail Rig
Hardshell Kayak Sail Rigs
PFD's (Life Jackets)
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