The better wood floor installation method largely depends on the specific project requirements, budget, and the type of wood flooring being used. However, the most commonly recommended method in the United States is the "nail-down" installation. This method involves nailing the wood planks directly to the subfloor, providing a solid and durable foundation for the flooring.

The nail-down method is preferred due to its longevity and structural integrity. According to the National Wood Flooring Association (NWFA), nail-down installations can last up to 40 years or more with proper care and maintenance. This longevity is attributed to the direct attachment of the wood planks to the subfloor, which minimizes the risk of separation or movement over time. Additionally, the NWFA reports that nail-down installations are more resistant to moisture and temperature changes, making them suitable for a wide range of environments.

In contrast, the "glue-down" method involves applying adhesive to the subfloor and pressing the wood planks into place. While this method is simpler and can be more cost-effective, it may not offer the same level of durability as the nail-down method. The glue can weaken over time, leading to potential issues such as delamination or warping. Furthermore, glue-down installations may be more susceptible to moisture damage, as the adhesive can become compromised in humid conditions.

Another factor to consider is the ease of installation. The nail-down method requires more labor and expertise, but it is generally considered more reliable. The NWFA emphasizes the importance of professional installation for both methods, as improper installation can lead to premature failure of the flooring.

In summary, the nail-down wood floor installation method is typically the better choice due to its longevity, structural integrity, and resistance to moisture and temperature changes. While the glue-down method may be simpler and more cost-effective, it may not provide the same level of durability and reliability in the long run.