Impedance levels vary (16 ohm vs NA), which can affect compatibility and audio output when used with different devices. boAt Rockerz 275 V2 uses Bluetooth 5.0 while boAt Immortal 121 supports Bluetooth 5.3, which can impact connectivity stability and efficiency. boAt Rockerz 275 V2 and boAt Immortal 121 are well-known options in the wireless headphone segment, offering a balance of audio quality, battery performance, and smart features. Battery life varies between the two (8 Hours (150 mAh) vs 10 / 40 Hours), which affects how long you can use them on a single charge. From a usability standpoint, both models provide a reliable and premium headphone experience. boAt Rockerz 275 V2 and boAt Immortal 121 offer different noise cancellation capabilities (No vs NA), which can impact how effectively they block external noise. There is a noticeable difference in weight (30 gm vs 45 Gm), which may affect comfort during extended use. Both models provide a wide frequency range, delivering a balanced audio experience across different types of content. Both headphones are equipped with capable drivers that deliver balanced sound output suitable for music, calls, and entertainment.

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