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. The driver size differs between the two (50 mm vs 40 mm), which can influence sound depth, bass response, and overall audio clarity. There is a noticeable difference in weight (310 g vs 273 Gm), which may affect comfort during extended use. The frequency response differs (5 Hz - 37,000 Hz vs 5 Hz - 25000 Hz), which can influence how well the headphones reproduce lows, mids, and highs. Denon AH-D400 and SHURE SRH840A offer different noise cancellation capabilities (NA vs CVC), which can impact how effectively they block external noise. In general, both options are suitable for everyday use including music, calls, travel, and work-from-home scenarios. If you're comparing Denon AH-D400 and SHURE SRH840A, both models offer a strong combination of sound performance, comfort, and modern wireless features. Impedance levels vary (32 Ohms vs 40 ohm), which can affect compatibility and audio output when used with different devices.

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