I’ve never actually cried in an Avatar episode, but going back and seeing as I am more emotional, I think I would cry more in Crossroads of Destiny. However its mostly at the end. Aang gives up Katara, which there is obviously another way. When Azula shots Aang, and Katara races to catch him. Zuko betraying Iroh and Iroh completely surrendering himself so Katara could get away and refusing to look at Zuko. Zuko’s always struggled with his destiny, and I think he felt bad with what happened to because he was actually happy in Ba Sing Se then anywhere else.