I don’t know if I’d pick Angel, but I do remember being knocked out by the episode “You’re Welcome.”Closest I can think of right now is Angel. On the one hand, I want to say season 4 was the best, but since it was highly serialized, it's hard to go back to individual episodes. Season 5 was much more episodic, and there is a stretch of 5 episodes where 4 of them are among my top favorites. (The 100th episode, Smile Time, and the two parter with Illyria.)