Just my amateur thoughts;
The wedges I have, required more work of course, but after the second one, I found progress and less time spent by keeping my stones clean (built up metal after 15 to 25 strokes, removed), this kept my steel on a clean fresh cutting surface. If I pyramid, the surface is cleaned between each level. It was easier to see the progress of the cut. Wedges seem to lay out a lot of metal.