I purchased both the Sony MDR-ZX770DC (Bluetooth/wired with noise cancellation) and the Bose Quiet-Comfort 25 (wired with noise cancellation) and ended up keeping the Sony's and returning the Bose. These two products have a lot of differences, but I was primarily curious about the noise cancellation feature which they have in common which is why I will compare and contrast these two for this review. To summarize, both headphones are very nice and I can understand why a person would choose one or the other (or both).Disclaimer: I'm not an audiophile elitist. I'm more than happy with the cheap Samsung ear-bud headphones that came packaged with my Samsung Note 4. But as a musicophile I love to explore different sounds and can appreciate the differences in sound offered by different headphone brands/styles/models/etc. I will give anything a chance whether it be some cheap $5 headphones from China or $1000 headphones handmade by an artist in your city. I have no beef with Bose, or Beats, or any other brand.Noise Cancellation: I will tell you that if you're in the market for a set of headphones with a noise cancellation feature (at the expense of over features like bluetooth, sound quality, cost,etc) look no further than the Bose 25's. I’ve never encountered a headphone that does noise cancellation better than the Bose 25. The Sony's have an acceptable to good NC feature, but the Bose 25’s are excellent at this! If you are primarily looking for excellent noise cancellation and money isn't an object, choose the Bose. I tested the Sony and Bose in multiple environments that included a variety of background noise (from the constant humming of an in-ceiling AC unit above my area at work, to the chatter and sounds from a local coffee shop, to bickering, tired children - the Bose offered superior noise cancellation hands down). Don’t believe me? Buy both, give them a try, I can pretty much guarantee you that you will determine that the 25’s are superior at NC. I don't travel much so I don't personally benefit from owning the world's premier noise cancelling headphone (while kind of liking having the option to occasionally use noise cancellation which is why I happened upon the Sony’s).Sound quality: Most folks know that there are a lot of factors at play when it comes to sound quality from headphones. Many headphones need to be broken in before you get a definitive idea of their potential (ie, might sound flat out of box, but becomes "bright" after 20+ hours of use). Also of note, if a headphone has noise cancellation, it has to be turned on or the headphone will not sound as good. That is definitely the case with the Bose where it becomes borderline unlistenable when NC is powered off, and to a lesser extent the case with the Sony’s when used in wired mode with NC powered off (it sounded good in Bluetooth mode with NC off though).My little multi hour test of the Sony and Bose likely was insufficient to gauge the full potential of both products. But with that said, in general, I'm not a huge fan of the Bose sound. I thought the 25's were underwhelming in low's and high's. Sure, I can use an in-app equalizer (Spotify offers this) to tweak the sound, and maybe some more time would have assisted in breaking the 25's in. But I didn’t love the sound that the 25’s offered out of box. To be clear, that isn’t to say the Bose sounded poor. They sounded fine, I just didn’t love their sound.In contrast, I like how the Sony's sound out of box. I listen to everything from classical to heavy metal, jazz to rap, electronic to pop (and everything in-between). I also like podcasts where spoken word can be made or broken by the booming bass of a person’s (deep) voice. In my experience Sony’s headphones provide an enjoyable listening experience regardless of genre of music. That is one of the benefits of having a well-balanced out of box product. In respects to sound quality, Sony has always impressed me. Clear highs, moderate mids, and sufficient bass seem to be the Sony ticket whether it be the industry standard (wired) Sony MDR7506's or the (Bluetooth) MDR-ZX770DC's being reviewed now.Price: If I traveled a lot, via plane or public transportation, the $300 price tag on the 25’s would be easily justified. However, since I don’t travel often, and don’t have a highly distracting work area that would benefit from effective NC, I cannot justify the $300 price tag for the Bose when the Sony’s cost roughly half of the price and have better sound quality (imho).Conclusion: If you have the money, consider ordering both the Bose QC25’s and the Sony MDR-ZX770DC’s so that you can experience both headphones for yourself. Each headphone has its ups and downs. If NC is what you desire, choose the Bose. If you’re on the market for a wireless headphone that has NC functionality, consider the Sony’s. Happy listening!