From a usability standpoint, both models provide a reliable and premium headphone experience. Both headphones are equipped with capable drivers that deliver balanced sound output suitable for music, calls, and entertainment. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel. Both headphones are designed for comfort and can be used for extended listening sessions without major discomfort. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. The frequency response differs (10 Hz - 20000 Hz vs 18 Hz -20000 Hz), which can influence how well the headphones reproduce lows, mids, and highs. If you're comparing Koss Plug and Koss KEB15i, both models offer a strong combination of sound performance, comfort, and modern wireless features. Both models feature noise cancellation, helping reduce background noise for a more immersive listening experience.

Verdict: Choosing between Koss Plug and Koss KEB15i depends on whether you value better sound, longer battery life, or enhanced features.