Koss UR23i and JBL E35 are premium wireless headphones designed to deliver high-quality sound along with advanced features like noise cancellation and long battery life. Overall, both headphones are feature-rich and cater to users looking for a combination of sound quality, comfort, and wireless convenience. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. Both models feature noise cancellation, helping reduce background noise for a more immersive listening experience. There is a noticeable difference in weight (NA vs 168 gm), which may affect comfort during extended use. Impedance levels vary (34 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 (20 Hz - 20000 Hz vs 20 Hz - 20000 kHz), which can influence how well the headphones reproduce lows, mids, and highs.

Verdict: Choosing between Koss UR23i and JBL E35 depends on whether you value better sound, longer battery life, or enhanced features.