boAt Rockerz 255R uses Bluetooth 4.1 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. In general, both options are suitable for everyday use including music, calls, travel, and work-from-home scenarios. boAt Rockerz 255R and boAt Immortal 121 are well-known options in the wireless headphone segment, offering a balance of audio quality, battery performance, and smart features. Impedance levels vary (16 ohm vs NA), 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. There is a noticeable difference in weight (NA vs 45 Gm), which may affect comfort during extended use. boAt Rockerz 255R and boAt Immortal 121 offer different noise cancellation capabilities (No vs NA), which can impact how effectively they block external noise. Battery life varies between the two (6 Hours vs 10 / 40 Hours), which affects how long you can use them on a single charge.

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