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 Maximoff (better known as her superhero alter-ego, the Scarlet Witch) is arguably the most powerful sorcerer/magic user in the entire Marvel Universe. The Scarlet Witch's magic abilities are practically limitless, ranging from mind control or creating illusions to full-on telekinesis and shooting hex bolts.
Wanda Maximoff has never truly been defeated, only "losing" to the combined forces of Doctor Strange, Wong, and America Chavez after realizing the error in her ways. For a time, Wanda posed the greatest threat to the Multiverse, going on a violent rampage on Earth-838.
While he may not have any superhuman abilities, Hawkeye is a crucial member of the team and one of the Avengers who can beat the Scarlet Witch.
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.
Although characters like Magneto and Storm can beat MCU's Wanda in a fight, Scarlet Witch's powers in the comics can only be compared to a handful of other Marvel characters. That short list includes Kevin MacTaggert, also known as Proteus, an energy-hungry mutant whose body cannot contain the amount of power he has.
God (One Above All)
The One Above All is the ultimate source of life and creation and the architect/creator of the Multiverse and everything that exists. The One Above All has stated that its "only weapon is love", which was further stated by the Watcher.
Thor, the god of Thunder, was undoubtedly the most powerful member of the original Avengers. His power continues to grow in the Marvel Cinematic Universe.
This revelation sheds light on how Wanda uses her powers, and she needs her sense of sight to control her hexes. 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!
While Thor is one of the most powerful beings in the MCU, it is known that Scarlet Witch's powers are superior. However, there are a lot of examples, even outside of Marvel, where powerful figures can still be defeated by those less so under the right circumstances.
Both in the comics and in the MCU, Scarlet Witch is physically inferior to Thanos.
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. Stephen, however, benefits from years of training as the Sorcerer Supreme.
Thor is more powerful than Scarlet Witch and would win a fight against her in the comics and the MCU. Thor's powerset is objectively more versatile than Wanda's, and he is physically superior in every aspect.
Of the Avengers who can beat Scarlet Witch, Vision is one of the strongest contenders. With an Android created using the Mind Stone, Vision possesses a vast array of abilities that could potentially match Scarlet Witch's reality-warping powers.
While Odin is the god with the power originally. Odin knows magic just as well as Wanda does, shown through his enchantments, and some of his feats. Odin wins, unless he falls into the odinsleep.
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. Now, as the Scarlet Witch, she doesn't even have to move objects with her mind to get what she wants.
Although characters like Magneto and Storm can beat MCU's Wanda in a fight, Scarlet Witch's powers in the comics can only be compared to a handful of other Marvel characters. That short list includes Kevin MacTaggert, also known as Proteus, an energy-hungry mutant whose body cannot contain the amount of power he has.
Scarlet Witch is indeed powerful and has overpowered magical abilities that make her a threat in both the comics and the MCU. But the thing is that Dark Phoenix is a threat to the entire universe as her powers are cosmic-level. In that regard, it is easy to see why Dark Phoenix is the more powerful character.
Thor, the god of Thunder, was undoubtedly the most powerful member of the original Avengers. His power continues to grow in the Marvel Cinematic Universe.
Scarlet Power
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.
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.
It wasn't until she had possession of the Darkhold that she was able to realize the full extent of her abilities. Before Multiverse of Madness, she was strong but not that powerful. That's why the Infinity Stones-powered Thanos could withstand Wanda's attack in Wakanda and then defeat her and destroy Vision.
Rogue is one of the X-Men's most formidable members. Her mutant ability to absorb the powers of others makes her a great powerhouse, as she can have the powers of anyone she touches. This ability has become even more potent since she mastered it, and it was also how she was able to kill Scarlet Witch.