Overall, both headphones are feature-rich and cater to users looking for a combination of sound quality, comfort, and wireless convenience. 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. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. Impedance levels vary (60 Ohms vs 35 ohm), which can affect compatibility and audio output when used with different devices. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel. The driver size differs between the two (NA vs 40 mm), which can influence sound depth, bass response, and overall audio clarity. There is a noticeable difference in weight (NA vs 240 GM), which may affect comfort during extended use. Koss PRO3AA and Audio Technica ATH-AVA400 are well-known options in the wireless headphone segment, offering a balance of audio quality, battery performance, and smart features.

Verdict: Choosing between Koss PRO3AA and Audio Technica ATH-AVA400 depends on whether you value better sound, longer battery life, or enhanced features.