Both headphones offer solid battery performance, making them suitable for long listening sessions and travel. There is a noticeable difference in weight (335 GM vs 305 GM), which may affect comfort during extended use. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. The driver size differs between the two (53 mm vs 45 mm), which can influence sound depth, bass response, and overall audio clarity. The frequency response differs (5Hz - 42KHz vs 5Hz - 40KHz), which can influence how well the headphones reproduce lows, mids, and highs. Audio Technica ATH-A990Z and Beyerdynamic DT 770 PRO X offer different noise cancellation capabilities (Sound Isolation vs Ambient Noise Isolation), which can impact how effectively they block external noise. Overall, both headphones are feature-rich and cater to users looking for a combination of sound quality, comfort, and wireless convenience. Audio Technica ATH-A990Z and Beyerdynamic DT 770 PRO X are well-known options in the wireless headphone segment, offering a balance of audio quality, battery performance, and smart features. Impedance levels vary (44 ohm vs 48 ohm), which can affect compatibility and audio output when used with different devices.

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