Usually in trilogies or franchises it is the original movie ( Raiders of the Lost Ark, Back to the Future, The Matrix) or the second part ( Empire Strikes Back, The Dark Knight) which are considered to be best of their respective trilogies/ franchises.
I am curious to know which trilogies or franchises out there are the ones where the third part is considered to be the best one. One obvious example I can think of is Lord of the Rings: Return of the King. While fans are usually divided on which of the three movies are the best one, in terms of accolades recieved Return of the King could be considered to be the best of the entire trilogy.
Which other third parts or threequels could be considered best in their franchises?