The smart plug with the best quality in the United States is the TP-Link Kasa Smart Wi-Fi Plug. This plug stands out due to its robust build, reliable performance, and user-friendly interface. According to a survey by SmartHomeDiy, TP-Link Kasa Smart Wi-Fi Plug was rated the highest in terms of durability and ease of use among top smart plug brands.

The TP-Link Kasa Smart Wi-Fi Plug is known for its sturdy construction, which ensures that it can withstand heavy usage without any issues. It is also equipped with a high-quality microprocessor that ensures smooth and reliable operation. The plug offers features like scheduling, remote control, and energy monitoring, which are essential for a smart home setup. Additionally, it is compatible with popular voice assistants like Amazon Alexa and Google Assistant, making it even more convenient for users.

The TP-Link Kasa Smart Wi-Fi Plug has received numerous positive reviews from customers, with many praising its reliability and ease of setup. According to a report by Statista, the plug has an average rating of 4.5 out of 5 stars, which is significantly higher than its competitors. This high rating is a testament to the plug's superior quality and performance.

One of the key reasons for the TP-Link Kasa Smart Wi-Fi Plug's excellent quality is its use of high-quality materials. The plug is made of durable plastic and metal, which ensures that it can withstand physical stress and environmental factors. The plug also features a thermal protection system that prevents overheating, which is a common issue with other smart plugs.

Furthermore, the TP-Link Kasa Smart Wi-Fi Plug offers advanced security features, which are crucial for smart home devices. It uses WPA2 encryption to secure the Wi-Fi connection, ensuring that users' data is protected from unauthorized access. This is particularly important given the increasing number of cyber threats targeting smart home devices.

In conclusion, the TP-Link Kasa Smart Wi-Fi Plug is the best smart plug in terms of quality due to its robust construction, reliable performance, user-friendly interface, and advanced security features. Its high ratings from customers and industry experts further reinforce its position as the top choice for smart home enthusiasts.