The Boult Audio Z40 and OnePlus Buds 2R are both great headphones. Both offer excellent sound quality, comfortable fit, and many features, but there are some differences that make one better suited for some people than the other. The Boult Audio Z40 offers more bass and better sound isolation, while the OnePlus Buds 2R has better noise cancellation and a longer battery life. The Z40 is the more affordable option, while the Buds 2R offer a bit more features. Both earbuds have decent sound quality, but in terms of sound quality, the Z40 offers the most. The Bass is powerful and detailed, and the mids and highs are well-balanced and clear. The Buds 2R have decent sound quality but are missing some of the low-end punch. The sound isolation on the Z40 is excellent and can block out most background noise. The Buds 2R offer decent passive noise cancellation, but are not as effective as the Z40 in this regard. The Z40 has a battery life of up to 8 hours, while the Buds 2R can last up to 10 hours. Both headphones have a fast charging time of 15 minutes. The Buds 2R come equipped with a lot of extra features such as dual-pairing, quick switch, and Ambient Aware, making it a better overall choice. The Z40 is a great option for those looking for a more affordable option with great sound quality and good noise isolation. The Buds 2R are a great choice if you need more features, longer battery life, and better noise cancellation. Overall, both headphones have their advantages and disadvantages, so it really comes down to which one suits your needs best.