While a double throated cock is stronger, they're ugly to my eye, especially the large ones on the 1777 Charlevilles and US. muskets after 1795. I much prefer the goose necked cocks, especially on Bess' and long rifles & full stocked Hawkens.
: The double throated cock looks OK on the Harpers ferry rifled musket with it's relatively small lock, however I do prefer the appearance of the 1728 & 1763 style French cock on any of the muskets or heavy(large bore) rifles.