If you want really quiet then a combination of slower speeds, larger props, constant speed, and good isolation is key. I've settled on a tunze 6255 at 20% on a sea sweep, a Jeboa CP-150 (weirdly this was the quietest of all the gyre pumps I tried at the time- and it requires basically no cleaning), and a custom tunze wavebox (with over-sized pump being under-driven). That is for a 180g. Like BlueZreef said, if you vary the gyre pumps (including jebao) they make horrific noise.
The Tunze Stream 3 is really quiet but there is some prop noise, especially at highest speeds, and I'm not a huge fan of the form factor. The Nero 5 seems quiet, although I have only heard it on a friends tank, but the larger prop size seems good for noise reduction.
I found MP40 QDs to be really loud, but I needed a lot of them because of the form factor and had to run them on higher speeds to get enough flow. I wasn't willing to spend $700 on a Mp60 to try them.
Remember that noise is all relative- what is quiet to one person might be really loud to another. Also chasing quiet can get very expensive. I would be just fine with a $200 tunze pump, but have a $500 tunze pump just to cut a little noise. And I've spent over $100 replacing all the fans in my lights with the quietest fans I could find.