In general, both options are suitable for everyday use including music, calls, travel, and work-from-home scenarios. The driver size differs between the two (NA vs 30 mm), which can influence sound depth, bass response, and overall audio clarity. Both models feature noise cancellation, helping reduce background noise for a more immersive listening experience. Impedance levels vary (100 Ohms vs 24 ohm), which can affect compatibility and audio output when used with different devices. The frequency response differs (18 Hz -20000 Hz vs 10 Hz - 24000 Hz), which can influence how well the headphones reproduce lows, mids, and highs. 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. There is a noticeable difference in weight (NA vs 125 Gm), which may affect comfort during extended use. If you're comparing Koss SB45 and Sony MDR-ZX310AP, both models offer a strong combination of sound performance, comfort, and modern wireless features.

Verdict: Choosing between Koss SB45 and Sony MDR-ZX310AP depends on whether you value better sound, longer battery life, or enhanced features.