Were the Bruce anchors in your observations genuine Bruce anchors or did you include clones?
I would also be curious about danforth, fortress, and clones of these. Are they just not found in the med?
I have not seen a great many Danforth anchors used in the Med as primary anchor. The Brittany a sort of stockless danforth is popular with french sailors and seems to rotate and reset better than the danforth to a change in wind direction, but I would still not rate it as a great choice in the hard sand often found here.
Fortress is a verycommon secondary anchor.