The driver size differs between the two (40 mm vs 10 mm), which can influence sound depth, bass response, and overall audio clarity. There is a noticeable difference in weight (200 gm vs 45 Gm), which may affect comfort during extended use. Impedance levels vary (32 ohm vs NA), which can affect compatibility and audio output when used with different devices. Battery life varies between the two (8 Hours vs 10 / 40 Hours), which affects how long you can use them on a single charge. Both models feature noise cancellation, helping reduce background noise for a more immersive listening experience. boAt Rockerz 450 uses Bluetooth 4.2 while boAt Immortal 121 supports Bluetooth 5.3, which can impact connectivity stability and efficiency. Both models provide a wide frequency range, delivering a balanced audio experience across different types of content. Overall, both headphones are feature-rich and cater to users looking for a combination of sound quality, comfort, and wireless convenience. boAt Rockerz 450 and boAt Immortal 121 are premium wireless headphones designed to deliver high-quality sound along with advanced features like noise cancellation and long battery life.

Verdict: Choosing between boAt Rockerz 450 and boAt Immortal 121 depends on whether you value better sound, longer battery life, or enhanced features.