So while I think it's an impossible exercise to compare these crafts in terms of difficulty or talent required, to be honest with you, wood marquetry was (personally) the one that impressed me the most when I studied the topic a bit, at least as an external observer of the crafts. If you are interested, Patek itself has a few introductory pages with pictures and videos on the subject of Rare Handcrafts that you may find useful: