Sokka was surprised at how fast he was growing to like Zuko. The other boy covered for his reunion with Suki in her cell, supported Sokka's mission to find his father – and he was way better at the plan thing than Aang.
Sokka rolled his eyes as he remembered Aang shedding his disguises everywhere they went, always so straightforward and honest about who he was: "I'm the Avatar!"
But then, Sokka had to admit . . .
As good as Zuko was at planning things and tricking people, Aang's honesty was one of the things Sokka liked best about him.