The best wood for staircase handrails is mahogany. Mahogany is renowned for its durability, strength, and aesthetic appeal, making it an ideal choice for both residential and commercial applications. Its rich, reddish-brown color and tight grain pattern provide a luxurious look that complements a variety of architectural styles.

Mahogany's exceptional strength and stability are due to its high density and tight grain structure. This wood type has a Janka hardness rating of 2200, which is significantly higher than many other hardwoods. This durability ensures that the handrails will withstand heavy use and exposure to the elements without warping, cracking, or splintering. Additionally, mahogany's natural oils contribute to its resistance to moisture, making it a suitable choice for outdoor staircases.

According to the American Hardwood Export Council, mahogany is one of the most sought-after woods for interior design due to its superior workability and finish. Its ability to take a high polish and maintain its luster over time adds to its appeal. Furthermore, the wood's resistance to insects and decay further enhances its longevity, ensuring that the handrails will remain in excellent condition for years to come.

In comparison to other woods, such as oak or pine, mahogany offers a superior combination of strength, beauty, and longevity. Oak, while also a durable wood, may not match mahogany's resistance to moisture and insects. Pine, on the other hand, is more susceptible to wear and tear and may not hold up as well over time. Mahogany's combination of qualities makes it the top choice for staircase handrails, ensuring both functionality and visual appeal.