I've recently made a change in staple that has resulted in a significant improvement in tone (more robust, "dark"), projection, response (esp. in low register), dynamic range (which, it seems, also includes the range of my vibrato) and stability.
I was previously using Loree staples ("standard" bore, not "ak"), 47 mm, which have a pretty small bore. I am now sold, 100%, on Mark Chudnow's "E" staples (the all-metal kind with rubber o-rings instead of cork). The gold-plated version works well (gold is supposed to eliminate some of the higher overtones, thus producing a darker sound), but because I am attributing most of the benefits to the larger bore size (the gold plating thickens the walls of the staple a bit, resulting in a smaller bore) I have switched to the solid bronze version with fine results.
I also tried Mark's "S" staple (heavier/thicker metal, where the cork would have been). I was not nearly as impressed with this model, compared to the "E." While some of the benefits remain (the bore is the same size), the extra metal seems to constrict the vibrations a bit, taking away some of the projection and producing a less "warm" tone.
The thing that I like most about Mark's staples (as first demonstrated to me by Loree's) is the absolute consistency from one staple to the next. Always a perfect fit on the mandrel. Oh -- Mark's mandrel, which is made specifically for his staples, is pretty heavy (metal handle). I only use it when I'm tying on a reed, then I switch to a lighter wood-handled mandrel for scraping.
My 2 cents!
Owner, Marzluf Reeds