Prolene VS PTFE sutures: which one do you prefer?

Prolene (polypropylene) VS PTFE sutures, which one do you prefer for perio and graft-related surgeries? Which one has better handling qualities in your hands? As PTFE sutures are slippery, do you feel it has slightly poorer frictional resistance to knot loosening? Is Prolene as expensive as ptfe?

Editor's Note: Prolene is simply the brand name for Ethicon's polypropylene suture.

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