There is a noticeable difference in weight (NA vs 240 GM), which may affect comfort during extended use. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. The driver size differs between the two (NA vs 40 mm), which can influence sound depth, bass response, and overall audio clarity. Impedance levels vary (60 Ohms vs 35 ohm), which can affect compatibility and audio output when used with different devices. Koss PRO3AA and Audio Technica ATH-AVA400 offer different noise cancellation capabilities (NA vs Sound Isolation), which can impact how effectively they block external noise. The frequency response differs (15 Hz - 22000 Hz vs 18Hz - 25KHz), which can influence how well the headphones reproduce lows, mids, and highs. Koss PRO3AA and Audio Technica ATH-AVA400 are premium wireless headphones designed to deliver high-quality sound along with advanced features like noise cancellation and long battery life. From a usability standpoint, both models provide a reliable and premium headphone experience. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel.

Verdict: Both headphones offer strong performance, and the right choice depends on your priorities such as battery life, comfort, and noise cancellation.