4 was the #1 choice for me, as it was the only time the winner prediction was correct.
Also had to choose 10, as it was a huge roller coaster of a season, and was to see how a new judging panel would fare out, post-Simon.
Other honorables were 6 and 9 for local influences, and 7 for the Cook/Archie final.
I have not been impressed with the ABC seasons, but season 3/18 could have been good, especially that it had an earlier start to the season. However, Coronavirus came, shut everything down, and all plans had to be changed.