The source of Wanda's unnatural abilities stem from a two-fold base; unparalleled mastery of actual magic and an innate power to warp reality. Due to exposure to mystic energies and forces at an early age, Wanda may reshape reality to various extremes.
In 2015, it was revealed in Uncanny Avengers (Vol. 2) #4 that she and Pietro are not mutants but humans who received superhuman genetics due to the experiments of the High Evolutionary. In Wanda's case, the High Evolutionary's genetic tampering made her more powerful in magic than she would have been otherwise.
She concluded her mass murder by killing Professor Xavier, arguably the most powerful telepath in the Marvel universe. The mere fact that she can single-handedly destroy five of Earth's mightiest heroes easily makes her the strongest MCU character.
Wanda was considered to be the Nexus Being of Earth-616, but there were still forces far more powerful than her. Perhaps the most obvious character that was more powerful than the Scarlet Witch was the One Above All, who acted as the "god" of the Marvel universe.
Wanda Mastered Her Powers After Clashing with Thanos
When it comes down to it, the Wanda vs. Thanos scenes in Infinity War and Endgame showed the Scarlet Witch in the infancy of her superhero career. It wasn't until she had possession of the Darkhold that she was able to realize the full extent of her abilities.
While Thor is one of the most powerful beings in the MCU, it is known that Scarlet Witch's powers are superior.
Scarlet Witch would obliterate The Hulk. Ray Hamilton no one said Spider-Man and he was the first to defeat Hulk.
While the Scarlet Witch is one of the most powerful beings in the Marvel Universe, her greatest weakness proves even Spider-Man can beat her.
Scarlet witch's biggest weakness is her durability. The only mode of defence was her powers. So her durability depended on her powers. She had two different stages in her power: before Infinity war and after Endgame.
Vision (White)
If this fight was between two complete strangers, Vision most likely wouldn't be able to take Wanda single-handed. However, the emotional connection between the two may give Vision the edge on Wanda that allows him to at least fight her to a stand still.
Wanda broke Thanos' sword which is made from Uru, meaning she can also destroy Thor's hammer. : r/marvelstudios.
Wanda was still a formidable adversary, capable of tipping the scales in favor of Ultron (James Spader) or the Avengers, depending on who she was helping. Still, without her Chaos Magic from Marvel Comics, Wanda was not more powerful than Thor or Hulk.
The Verdict: Scarlet Witch Is Stronger Than Captain Marvel
That said, Wanda has an edge due to Chaos Magic and her reality-warping abilities. Her telekinesis alone could nearly kill Thanos faster than Carol's punches.
Unlike Doctor Strange, Wanda was born with her chaos magic capabilities, therefore having her whole life to hone her skills. Wanda's Chaos Magic received a significant power boost from the Mind Stone, granting Scarlet Witch the aptitude for spontaneous creation and enough energy to take on Thanos single-handedly.
Scarlet Witch being able to revive herself effectively makes her immortal in much the same way the Five have brought resurrection to the mutant population. If anything, it's even more impressive.
To Be All Alone
There's little doubt that this is Wanda's greatest fear, as she's had to deal with it from the beginning of her time in the MCU. She couldn't deal with the prospect of being all alone when the events of Westview took place, projecting her fear into every person in the town.
As her powers likely come at least in part from the Mind Stone inside of Loki's scepter, Wanda's abilities include telekinesis, energy manipulation, and some form of neuroelectric interfacing that allows her to both read thoughts and also give her targets waking nightmares.
Does Scarlet Witch Become a Villain? The short answer is, yes, multiple times throughout the comics. The extent of her antagonism in Avengers Disassembled is extreme; through a chain reaction of events set in motion by chaos magic, she causes the violent deaths of Vision, Ant-Man, and Hawkeye.
The Scarlet Witch's most powerful enemies include Professor X and Doctor Strange, who she could fight in Doctor Strange in the Multiverse of Madness. The Scarlet Witch counts some of the greatest Marvel Comics supervillains among her most powerful enemies, including Doctor Doom and Ultron.
Hercules / Zeus
In fact, he is considered by many authorities to be the physically strongest character Marvel has ever created. According to legend, he replaced Atlas in holding the sky on his shoulders.
Black Bolt could have killed the Scarlet Witch in Doctor Strange: Multiverse of Madness if he had attacked immediately, before Reed Richards talked. Likewise, Maria Rambeau, the Captain Marvel of that universe, could have killed the Scarlet Witch if she had attacked the moment Black Bolt died.
If there's one superhero who can totally beat her, it would be Spider-Man. Remember when the Webslinger covered his foe's entire face with his web? That is one of his signature moves! Despite not having any supernatural powers, Spider-Man has the advantage in this situation.
Captain Marvel is the most powerful and powerful Avenger in the Marvel Cinematic Universe (MCU). Her incredible powers and determination have made her a valuable member of the Avengers.
Both are extremely powerful, but in Doctor Strange and the Multiverse of Madness, Wanda demonstrates the extent of her powers like never before. So in terms of raw force, she is definitely the more powerful of the two.