Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. There is a noticeable difference in weight (386 g vs 240 GM), which may affect comfort during extended use. Both headphones are equipped with capable drivers that deliver balanced sound output suitable for music, calls, and entertainment. Impedance levels vary (16 Ohms vs 35 ohm), which can affect compatibility and audio output when used with different devices. Philips M1MKIIBK-00 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. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel. The frequency response differs (6 Hz - 40000 Hz vs 18Hz - 25KHz), which can influence how well the headphones reproduce lows, mids, and highs. From a usability standpoint, both models provide a reliable and premium headphone experience. Philips M1MKIIBK-00 and Audio Technica ATH-AVA400 offer different noise cancellation capabilities (NA vs Sound Isolation), which can impact how effectively they block external noise.

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