I own the Bose QC25 and have never really been happy with its capability to block human voices. Perhaps the QC35 are better. I also read that the Sony noise cancelling headphones (MDR-1000x and successors) have eclipsed the Bose ones in noise-cancelling quality. Anyhow, having to charge (or change batteries) for headphones every day is really annoying.

My current setup involves in-ear monitors (Massdrop x MEE Audio Pinnacle PX IEM) plus gigantic 3M Peltor X5A earmuffs on top of them [1].

I look ridiculous wearing the 3M Peltor X5A but it sends a strong message that I don't want to be disturbed, and they do a much better job than the Bose headphones at blocking human voices.

I have read that an alternative is to wear headphones on top of in-ear monitors, playing music on the IEMs and white noise on the headphones. This is the setup for Starcraft II professional gamers in tournament settings, for example.

[1] pic: https://pics.dllu.net/file/dllu-pics/20180716_151629.jpg