Is that even a question? Zuko was so amazing, dynamic, deep....he was a GREAT firebender in book 1 and by book 3, he was an epic master at 16. Mako is good at 18 but nothing too amazing. But ZUKO was by far better.
toph definetly she was a almost a master and only 12
aang...so humble at wise...plus he had to go through so much
BASICALLY ATLA RULES