There is a noticeable difference in weight (45 Gm vs 20 GM), which may affect comfort during extended use. Both models feature noise cancellation, helping reduce background noise for a more immersive listening experience. Overall, both headphones are feature-rich and cater to users looking for a combination of sound quality, comfort, and wireless convenience. boAt Airdopes 138 uses Bluetooth 5.0+EDR while Unix UX-999 PRO 2 supports Bluetooth 5.1, which can impact connectivity stability and efficiency. Both headphones are equipped with capable drivers that deliver balanced sound output suitable for music, calls, and entertainment. Impedance levels vary (NA vs 32 Ohms), which can affect compatibility and audio output when used with different devices. Battery life varies between the two (3 / 12 Hours vs 40 Hours), which affects how long you can use them on a single charge. boAt Airdopes 138 and Unix UX-999 PRO 2 are well-known options in the wireless headphone segment, offering a balance of audio quality, battery performance, and smart features. The frequency response differs (20 Hz - 20000 Hz vs 20Hz - 20KHz), which can influence how well the headphones reproduce lows, mids, and highs.

Verdict: Choosing between boAt Airdopes 138 and Unix UX-999 PRO 2 depends on whether you value better sound, longer battery life, or enhanced features.