Beyerdynamic T 90 and Beyerdynamic MMX 300 are well-known options in the wireless headphone segment, offering a balance of audio quality, battery performance, and smart features. There is a noticeable difference in weight (425 g vs 332 g), which may affect comfort during extended use. 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. Both models feature noise cancellation, helping reduce background noise for a more immersive listening experience. From a usability standpoint, both models provide a reliable and premium headphone experience. Impedance levels vary (250 Ohms vs 32 ohm), which can affect compatibility and audio output when used with different devices. Both headphones are equipped with capable drivers that deliver balanced sound output suitable for music, calls, and entertainment. The frequency response differs (5 Hz - 40000 Hz vs 5 - 35 000 Hz), which can influence how well the headphones reproduce lows, mids, and highs.

Verdict: Choosing between Beyerdynamic T 90 and Beyerdynamic MMX 300 depends on whether you value better sound, longer battery life, or enhanced features.