Who is the strongest waterbender?

Answer 1

Aang when he is in the Avatar state. No normal water bender could do what Aang did at the north pole

Answer 2

Katara from "Avatar: The Last Airbender" is widely considered one of the strongest waterbenders in the series due to her skill, agility, and innovative techniques in bending. She has shown remarkable growth and mastery of waterbending throughout the show. Sokka's waterbending master, Pakku, is also regarded as one of the most powerful waterbenders in the series.