I know it's not on the list, but Echo Chamber is my least favorite. I actually really like the boss fight, it's one of the best designed boss encounters in the game outside of the raids. But getting to the actual Echo Chamber is such a pain in the ass. No matter what version you get, it just takes way too long to get there. I'm also in the super minority that actually likes the Rockets McDickface strike. Even in year 1 it was one of my favorite. It's just so damn easy I don't know why people hate it so much.