I started shooting feathers on my arrows a couple years ago for a few reasons. First off I learned how to fletch and make my own arrows instead of paying someone else. I also was able to customize them for best arrow flight, strength, etc... In doing this I learned that shooting certain feathers at "compound" speeds creates more noise than shooting Blazers and smaller type synthetic vanes.
Feathers, especially something like a 4 or 5 inch "shield" design, "grab" a lot of air, therefore making noise. That is also why a large feather with stabilize an arrow quite well, especially when using larger broadheads.
I started using Razyr feathers last year but didn't get good arrow flight. I didn't have enough time to straigten out the issues I was having.
Overall, experimenting with different feather cuts can help you find one that is more quiet than others. I think feathers are the way to go and a lot of fun to work with. The feathers I have used make a noticeable noise more so than when I use Blazers.
If you are cutting your own arrows using something like the Little Chopper, you can adjust it to cut a smaller height.