Battery life varies between the two (3.5 Hours vs 5 / 7 / 150 Hours), which affects how long you can use them on a single charge. Impedance levels vary (22 ohm vs 16 ohm), which can affect compatibility and audio output when used with different devices. boAt Airdopes 291 and boAt Airdopes 621 offer different noise cancellation capabilities (CVC vs NA), which can impact how effectively they block external noise. Both models provide a wide frequency range, delivering a balanced audio experience across different types of content. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. In general, both options are suitable for everyday use including music, calls, travel, and work-from-home scenarios. If you're comparing boAt Airdopes 291 and boAt Airdopes 621, both models offer a strong combination of sound performance, comfort, and modern wireless features. Both headphones are equipped with capable drivers that deliver balanced sound output suitable for music, calls, and entertainment. There is a noticeable difference in weight (8 gm vs 129 Gm), which may affect comfort during extended use.

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