I agree with the latter comment. I stopped watching DS9 around the time TNG ended, so I'm not familiar with the later seasons of that show.
As an aside, one thing that I thought was weird about Discovery was how when Burnham first boarded the ship, she noticed a bunch of black-pinned guards standing around. I remember her asking about them and being told they were Section 31. But then I'm pretty sure we never saw them again. And when Section 31 showed up later in the series, it was a separate group who had their own ship and didn't wear uniforms let alone black pins. I guess maybe the black-pinned guards were an idea that got quietly dropped from the show.