Cork down locking for me; if I use or buy wood it would be Amboina burl. I have 2 with that and like then probably because it's not too noticeable and kinda looks like cork from a distance. I had 2 orvis rods that came with wood and sent them both back for a rebuild of the grip; swapped them to down locks with cork............... I ordered a New Hardy Spey rod that has not arrived yet, I forget if it's cork or graphite
Whatever it is I will leave it alone.