In terms of overall quality and characteristics, rosewood is generally considered better than old elm wood. Rosewood is known for its rich color, exceptional durability, and unique grain patterns, making it highly sought after for high-end furniture, musical instruments, and decorative items. On the other hand, old elm wood is valued for its strength and workability but lacks the visual appeal and rarity of rosewood.

Rosewood's superior qualities are attributed to its dense and heavy nature, which makes it highly resistant to moisture and insects. This durability ensures that items made from rosewood will last for generations. Additionally, rosewood's rich color and grain patterns are highly prized in the woodworking industry, as they add a luxurious and timeless aesthetic to any piece. The Janka hardness scale, which measures the resistance of wood to indentation, ranks rosewood at around 2200, making it one of the hardest woods available. In comparison, old elm wood typically ranks around 1290 on the Janka scale, indicating it is less dense and durable.

Furthermore, rosewood is a protected species under international trade agreements, which has driven up its value and rarity. This scarcity adds to its appeal and ensures that only the most skilled artisans have the opportunity to work with this material. In contrast, elm trees are more common and abundant, making old elm wood more accessible and less expensive.

While rosewood is undoubtedly superior in many aspects, it is important to consider the environmental impact of using this wood. The overharvesting of rosewood has led to its endangered status, and responsible sourcing is crucial. In contrast, old elm wood can be a more sustainable choice, as it is often salvaged from older structures or fallen trees, reducing the need for new timber extraction.

In conclusion, rosewood is generally considered better than old elm wood due to its superior durability, aesthetic appeal, and rarity. However, the environmental impact of rosewood should be carefully considered, and old elm wood can be a more sustainable alternative when responsibly sourced.