Throughout his arc in Star Wars, from Jedi Padawan to Sith Lord, Darth Vader always chafed at the bonds of authority. Whether it was with the Jedi High Council or Darth Sidious himself, Anakin Skywalker never made peace with playing second fiddle. However, despite his enormous Force potential, and his status as the Chosen One, that is what Anakin has always been: second best.
Source：https://www.cbr.com/star-wars-darth-vader-sidious-most-powerful-sith/
