If I have to pick one, it's a tough call but I'd say cocobolo.
I like all woods though, including any type of burl, desert ironwood, ebony, rosewood... And also bone, depending on the color, either smooth or jigged. Stag is great, but I'm more particular with stag as not all of it is a good match to a particular knife.
Probably have more Delrin than any other material, but I wouldn't call it my favorite.
Despite problems, it's hard to beat some beautiful vintage celluloids.
Mother of pearl, abalone, and leather round up the favorites.
Anything BUT black plastic. :barf: Although I have plenty of that too.
