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. Both headphones are equipped with capable drivers that deliver balanced sound output suitable for music, calls, and entertainment. Both models provide a wide frequency range, delivering a balanced audio experience across different types of content. There is a noticeable difference in weight (8 gm vs 129 Gm), which may affect comfort during extended use. Overall, both headphones are feature-rich and cater to users looking for a combination of sound quality, comfort, and wireless convenience. boAt Airdopes 291 and boAt Airdopes 621 are well-known options in the wireless headphone segment, offering a balance of audio quality, battery performance, and smart features. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible 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.

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