Both headphones offer solid battery performance, making them suitable for long listening sessions and travel. The driver size differs between the two (NA vs 10 mm), which can influence sound depth, bass response, and overall audio clarity. Koss SB40 and SoundMAGIC E11C offer different noise cancellation capabilities (NA vs Sound Isolation), which can impact how effectively they block external noise. Impedance levels vary (120 Ohms vs 42 Ohms), which can affect compatibility and audio output when used with different devices. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. Koss SB40 and SoundMAGIC E11C are well-known options in the wireless headphone segment, offering a balance of audio quality, battery performance, and smart features. The frequency response differs (20 Hz - 20000 Hz vs 15 Hz - 22KHz), which can influence how well the headphones reproduce lows, mids, and highs. There is a noticeable difference in weight (NA vs 15 GM), which may affect comfort during extended use. From a usability standpoint, both models provide a reliable and premium headphone experience.

Verdict: Both models are competitive, and your decision should be based on your usage needs and preferred features.