Both models provide a wide frequency range, delivering a balanced audio experience across different types of content. Both models feature noise cancellation, helping reduce background noise for a more immersive listening experience. The driver size differs between the two (40 mm vs 10 mm), which can influence sound depth, bass response, and overall audio clarity. Impedance levels vary (32 ohm vs NA), which can affect compatibility and audio output when used with different devices. boAt Rockerz 450 uses Bluetooth 4.2 while boAt Immortal 121 supports Bluetooth 5.3, which can impact connectivity stability and efficiency. boAt Rockerz 450 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 vs 10 / 40 Hours), which affects how long you can use them on a single charge. There is a noticeable difference in weight (200 gm vs 45 Gm), which may affect comfort during extended use. From a usability standpoint, both models provide a reliable and premium headphone experience.

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