There is a noticeable difference in weight (NA vs 240 g), which may affect comfort during extended use. Koss QZ900 and Beyerdynamic DT 287 PV MK II offer different noise cancellation capabilities (Yes vs NA), which can impact how effectively they block external noise. Impedance levels vary (32 Ohms vs 250 ohm), which can affect compatibility and audio output when used with different devices. If you're comparing Koss QZ900 and Beyerdynamic DT 287 PV MK II, both models offer a strong combination of sound performance, comfort, and modern wireless features. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel. From a usability standpoint, both models provide a reliable and premium headphone experience. The frequency response differs (20 Hz - 20000 Hz vs 10 - 30.000 Hz), which can influence how well the headphones reproduce lows, mids, and highs. Both headphones are equipped with capable drivers that deliver balanced sound output suitable for music, calls, and entertainment. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices.

Verdict: Both models are competitive, and your decision should be based on your usage needs and preferred features.