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. There is a noticeable difference in weight (250 g vs 300 g), which may affect comfort during extended use. In general, both options are suitable for everyday use including music, calls, travel, and work-from-home scenarios. Impedance levels vary (250 ohm vs 80 ohm), which can affect compatibility and audio output when used with different devices. The frequency response differs (5 - 35.000 Hz vs 5 - 30.000 Hz), which can influence how well the headphones reproduce lows, mids, and highs. Both models feature noise cancellation, helping reduce background noise for a more immersive listening experience. Both headphones are equipped with capable drivers that deliver balanced sound output suitable for music, calls, and entertainment. Beyerdynamic DT 990PRO and Beyerdynamic DT 770 M are well-known options in the wireless headphone segment, offering a balance of audio quality, battery performance, and smart features.

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