Rosewood is generally considered more valuable than Wenge. This is due to several factors, including rarity, demand, and legal restrictions. Rosewood is a term that encompasses several species of trees, all of which are highly sought after for their rich, dark red to purple heartwood and exceptional durability. The most famous and valuable species is Dalbergia rubra, also known as Brazilian Rosewood.

Wenge, on the other hand, is a species of tree native to tropical Africa. It is also prized for its dark, rich brown to black heartwood, which is highly sought after for its beauty and durability. However, Wenge is less rare and has a more abundant supply compared to Rosewood.

The value of Rosewood is further elevated by its inclusion on the CITES (Convention on International Trade in Endangered Species of Wild Fauna and Flora) Appendix II, which restricts international trade in order to prevent overexploitation. This legal status not only makes Rosewood more difficult to obtain but also increases its perceived value among collectors and buyers.

Data from the International Union for Conservation of Nature (IUCN) and the CITES Secretariat indicate that Rosewood species are facing significant threats due to overharvesting and habitat loss. For example, the IUCN Red List lists several Rosewood species as endangered or critically endangered. In contrast, while Wenge is also listed on CITES Appendix II, it is not as critically endangered as some Rosewood species.

Additionally, the demand for Rosewood has been driven by the luxury furniture and musical instrument markets, particularly in Asia, where it is used in the construction of high-end guitars and traditional instruments. This demand has only increased the value of Rosewood, making it more expensive than Wenge.

In summary, Rosewood is more valuable than Wenge due to its rarity, legal restrictions, and higher demand in luxury markets. The data from conservation organizations and trade agreements highlight the critical need for sustainable management and conservation efforts to protect Rosewood species from extinction.