ok, this is really me now.
natural fibers are always best for keeping your kes in top shape. even hair dressers will tell you this. the wooden kanga avoids static build up, and the wider spaced teeth help keep from breaking the kes. on the head, the wooden kanga can be used as an excellent massager, bringing blood flow to the scalp, which stimulates healthy hair growth and can even relieve tension headaches.
guru sahib was way ahead of his time when he gave us these gifts.
but ya, i don't have any dhara to speak about so i can't really comment on the question with any authority.