Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. Impedance levels vary (36 Ohms vs 32 ohm), 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. If you're comparing Koss KSC21 and Samsung EG920, both models offer a strong combination of sound performance, comfort, and modern wireless features. The frequency response differs (50 Hz - 18000 Hz vs 20 Hz - 20000 KHz), 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 designed for comfort and can be used for extended listening sessions without major discomfort. The driver size differs between the two (NA vs 12 mm), which can influence sound depth, bass response, and overall audio clarity. From a usability standpoint, both models provide a reliable and premium headphone experience.

Verdict: Choosing between Koss KSC21 and Samsung EG920 depends on whether you value better sound, longer battery life, or enhanced features.