There is a noticeable difference in weight (NA vs 3 gm), which may affect comfort during extended use. The driver size differs between the two (NA vs 12 mm), which can influence sound depth, bass response, and overall audio clarity. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel. The frequency response differs (25 Hz - 15000 Hz vs 5 Hz - 25,000 Hz), which can influence how well the headphones reproduce lows, mids, and highs. Impedance levels vary (32 Ohms vs 16 ohm), which can affect compatibility and audio output when used with different devices. Koss UR18 and Sony MDR-EX255AP are well-known options in the wireless headphone segment, offering a balance of audio quality, battery performance, and smart features. In general, both options are suitable for everyday use including music, calls, travel, and work-from-home scenarios. 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.

Verdict: Choosing between Koss UR18 and Sony MDR-EX255AP depends on whether you value better sound, longer battery life, or enhanced features.