So I'm considering: Noise isolation: - Sony MDR-1AM2 (updated version of the much suggested Sony MDR-1A) Noise cancelling: - Sony WH-1000XM2 For use in an office with the source being Spotify on my mobile (LDAC compatible). I've read conflicting things about noise cancelling for office use, some say more appropriate for the hum of an plane engine, the tube etc and less for the office whilst others say it does reduce the overall noise down a bit. Admittedly it won't be silent by any stretch of the imagination. But it may be that closed back noise isolation headphones would do similar? I've read there's a very slight amount of white noise from the noise cancelling headphones albeit undetectable when music is playing. I wonder for office use if closed back will get me the same results as IEMs / noise cancelling but a better sounding? Budget is £250-300. Cheers!