Best sidequests in the Fallout games?

I’m doing a playthrough of 3, New Vegas, and 4. Mostly focused on beating the main quests and the DLCs but I want to make sure I hit the best side quests on the way. I’m making my push to finish 3 right now and I’ve finished the DLC, Oasis, cannibals, vampires, ant quest, the other ant quest, and a bunch of stuff I’m...