The only ones ive used, are ones with a cork grip, and they appear to have a more comfortable hold, than ones made of plastic, and for some reason, my hands do not get as sweaty.
Ive used them three times, and found them a nuisance, but they have their uses, depending on the right conditions.
One thing i do remember many years ago, when i was an avid Challenge walker in South Wales, was that many competitors liked to use a walking pole, or some kind of support, as it somehow alleviated arm and shoulder tiredness over long distances.
A modern Walking pole, with its adjustability, certainly has its place in the right environment, but i found they did not work for me.