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. The frequency response differs (21 - 18000 Hz vs 5 Hz - 24,000 Hz), which can influence how well the headphones reproduce lows, mids, and highs. The driver size differs between the two (40 mm vs 9 mm), which can influence sound depth, bass response, and overall audio clarity. Sennheiser HD-201 and Sony MDR-EX155AP offer different noise cancellation capabilities (No vs NA), which can impact how effectively they block external noise. If you're comparing Sennheiser HD-201 and Sony MDR-EX155AP, both models offer a strong combination of sound performance, comfort, and modern wireless features. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. There is a noticeable difference in weight (165 g (without cable) vs 3 gm), which may affect comfort during extended use. Impedance levels vary (24 ohms vs 16 ohm), which can affect compatibility and audio output when used with different devices.

Verdict: Both headphones offer strong performance, and the right choice depends on your priorities such as battery life, comfort, and noise cancellation.