Overall, both headphones are feature-rich and cater to users looking for a combination of sound quality, comfort, and wireless convenience. Sennheiser PXC 250-II and Beyerdynamic DT 990 PRO are premium wireless headphones designed to deliver high-quality sound along with advanced features like noise cancellation and long battery life. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. The driver size differs between the two (40 mm vs NA), which can influence sound depth, bass response, and overall audio clarity. There is a noticeable difference in weight (Approx 66 g vs 250 g), which may affect comfort during extended use. Impedance levels vary (160/300 Ohms-Active/Passive vs 250 Ohms), 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. Sennheiser PXC 250-II and Beyerdynamic DT 990 PRO offer different noise cancellation capabilities (Yes vs NA), which can impact how effectively they block external noise. The frequency response differs (10 Hz - 21000 Hz vs 5 Hz - 35000 Hz), which can influence how well the headphones reproduce lows, mids, and highs.

Verdict: Choosing between Sennheiser PXC 250-II and Beyerdynamic DT 990 PRO depends on whether you value better sound, longer battery life, or enhanced features.