In terms of which is better, rosewood or teak, the answer largely depends on the specific application and personal preference. Rosewood is prized for its rich color, unique grain patterns, and exceptional durability, making it a favorite for high-end furniture and musical instruments. Teak, on the other hand, is renowned for its natural oil content, which provides excellent weather resistance and makes it ideal for outdoor furniture and boat decks.

Rosewood is considered superior in terms of aesthetics and durability. It has a dark, rich color that can range from a deep red to a dark brown, with intricate grain patterns that add visual interest. This wood is also highly resistant to moisture and insects, making it a durable choice for furniture that will be exposed to the elements. According to the Forest Products Laboratory of the United States Department of Agriculture (USDA), rosewood has a Janka hardness rating of 2,200 lbf (pounds-force), which is significantly higher than teak's 1,150 lbf. This high hardness contributes to rosewood's longevity and resistance to wear and tear.

Teak, while not as aesthetically diverse as rosewood, offers its own set of advantages. Its natural oil content makes it highly resistant to moisture, which is why it is a popular choice for outdoor furniture and boat decks. This oil also gives teak a golden-brown hue that ages gracefully. The American Hardwood Export Council (AHEC) reports that teak has a natural resistance to decay, which means it requires minimal maintenance and can last for decades. Additionally, teak is known for its stability, which makes it an excellent choice for furniture that will be used in areas with varying temperatures and humidity levels.

In terms of sustainability, rosewood is a more controversial choice. It is a protected species under the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES), which restricts its trade to ensure that it is not harvested unsustainably. This has led to a rise in the popularity of alternative woods that are more readily available and sustainable, such as teak. Teak, while not as endangered as rosewood, is also subject to sustainable harvesting practices to ensure its long-term availability.

Ultimately, the choice between rosewood and teak depends on the desired aesthetic, the intended use, and the sustainability considerations. For high-end, indoor furniture and musical instruments, rosewood's unique beauty and durability make it the superior choice. For outdoor furniture and applications where weather resistance is paramount, teak's natural oils and stability make it the more suitable option. Both woods have their own set of advantages and disadvantages, and the best choice will depend on the specific needs and preferences of the user.