The more valuable wood between rosewood and purple sandalwood is rosewood. Rosewood, also known as Dalbergia genus, is highly prized for its rich, dark red to brown color, fine grain, and exceptional durability. It is used in high-end furniture, musical instruments, and decorative items, which drives up its value. Purple sandalwood, on the other hand, is also a valuable wood, but it is less commonly used in commercial applications, making rosewood more valuable.

Data from the International Union for Conservation of Nature (IUCN) indicates that rosewood species are listed as critically endangered due to overharvesting and illegal logging. This scarcity has significantly increased its value on the black market. For instance, the price of rosewood can range from $10,000 to $30,000 per cubic meter, depending on the species and quality. In contrast, purple sandalwood, while also endangered, is less sought after in the international market, with prices typically lower than rosewood.

The demand for rosewood is driven by its aesthetic appeal and the cultural significance it holds in various Asian countries, where it is used in traditional medicine and rituals. The high demand and limited supply have led to a surge in prices. Additionally, the international trade in rosewood is heavily regulated due to its endangered status, which further contributes to its value.

Purple sandalwood, while also a valuable species, is less sought after due to its less prominent role in international trade and its availability in some regions. It is used in traditional medicine and incense production, but its demand does not match that of rosewood. The price of purple sandalwood is generally lower, ranging from $1,000 to $5,000 per cubic meter, depending on the quality and region.

In conclusion, rosewood is more valuable than purple sandalwood due to its rarity, demand, and cultural significance. The IUCN's classification of rosewood species as critically endangered underscores the urgency of conservation efforts and highlights the importance of sustainable practices in the wood industry.