The best drop I ever had in destiny had to be forsaken. I don’t know why but my luck was insanely ridiculous. I had about 40ish exotics drop in the first month. But the best drop ever had to be during an ascendant challenge. It was ascendant challenge where you killed the taken blights while running away from the knights until you could kill the crystals. I got an exotic drop from 1 of the knights, an exotic from 1 of the thrall in the area, none from the chest and then a double exotic drop from turning in the bounty.