If you're comparing Beyerdynamic DT 990 PRO and Beyerdynamic DT 252, both models offer a strong combination of sound performance, comfort, and modern wireless features. There is a noticeable difference in weight (250 g vs 170 g), which may affect comfort during extended use. Both models feature noise cancellation, helping reduce background noise for a more immersive listening experience. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel. The frequency response differs (5 Hz - 35000 Hz vs 10 Hz - 30000 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. From a usability standpoint, both models provide a reliable and premium headphone experience. Impedance levels vary (250 Ohms vs 80 Ohms), which can affect compatibility and audio output when used with different devices.

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