I've been happy with the Vulcan on my boat (33kg / 73lb Vulcan on a 38' / 27k lb boat). It tests near the top of the pack as well. I picked it before some of the more thorough testing had been done, as in my case, the shape of it allowed me to fit a larger anchor than some of the other modern designs without hitting the hull.
Anchors of pretty much any design work significantly better at larger sizes. They're heavier to push through weed and such effectively, and they're less susceptible to fouling with small sticks, shells, etc. The anchors get bigger, but the debris doesn't, so it becomes less significant.
As far as the Fortress and Danforth anchors, they're special purpose. For straight line holding in any bottom soft enough for it to set, especially soft mud, they're unbeatable (pound for pound). But they don't always handle reversals gracefully, and they're often not great in weeds, shells, sticky mud, etc. as the hinge can get jammed up and prevent the flukes from getting in a good position to set (especially an issue for a re-set after a direction change).