In the main Marvel Comics continuity, despite all her power, the Scarlet Witch could not stand next to god-like forces such as the Phoenix Force, Galactus, and the Living Tribunal.
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.
Thor's powerset is objectively more versatile than Wanda's, and he is physically superior in every aspect. Wanda has enough juice to alter reality and might use her magic to counter some of his powers, but she has nothing to counter his physical superiority.
Part of that lineup is the Scarlet Witch, who Iron Man mentions is the most powerful mutant alive. Even if she's no longer a mutant in the main Marvel Universe, the Scarlet Witch is still considered one in the world of Earth X, which is an extension of an era where the Scarlet Witch was still a mutant.
There is no stronger force than creation itself, and in Marvel Comics, this force is represented by the One-Above-All.
1. One-Above-All. Essentially, the god of Marvel, the One-Above-All, is the supreme leader of the multiverse and the ultimate source of love and good, which is why the multiverse exists in the first place.
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.
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.
Thor's immense strength, combat prowess, control over lightning, and enchanted hammer, Mjolnir, make him a formidable opponent against Scarlet Witch. In Avengers: Age of Ultron, he demonstrated his ability to resist her reality-warping powers and even physically overpower her.
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.
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.
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.
Originally Answered: Who is more powerful between Prime Odin (MCU) and Scarlet Witch (Wandavision)? I'd say Odin. Scarlet Witch is powerful, but she doesn't have the reputation Odin does. For example: Odin, a while ago, defeated Surtur.
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.
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.
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.
Additionally, Wanda demonstrated just how powerful she was in Infinity War, when she was able to repel Thanos while simultaneously destroying Vision's Mind Stone. So it stands to reason that Wanda would have been able to single-handedly whoop Thanos into oblivion, had he not called in cover fire from above.
Scarlet Witch is the nexus being of Reality-616, meaning that her very presence holds the structural fabric of the universe in place. But The One-Above-All can simply rewrite her story any way it wants and even erase her character from Marvel's pages entirely.
Scarlet Witch's power is vast, but gods are beyond her. To begin with, Scarlet Witch isn't the type to lead with her most powerful attacks; she's not going to try to completely rewrite reality to beat Highfather quickly. Even if she did, Highfather is the leader of the New Gods, the head of a pantheon.
Thanos is recognized as one of the most powerful characters in the MCU's Infinity Saga. As the only Avenger that proved capable of single-handedly defeating him, Wanda ranks easily as one of the most powerful Avengers.
Marvel Proves Scarlet Witch Can Be Beaten By Spider-Man In Avengers #22. Scarlet Witch is known as the strongest Marvel hero and Avenger today. The extent of her powers cannot be measured or equaled, but she is not exempted from having no weakness.
2) Captain Marvel
She holds her own with Thanos in hand-to-hand combat for longer than Thor, Iron Man, or Steve Rogers, and takes down his enormous warship single-handedly.
Determining the strongest Avenger in the MCU is tricky since each brings something unique to the table, and Thor and Hulk are the top contenders in terms of sheer physical strength. However, regarding versatility and range of abilities, Captain Marvel and Doctor Strange are formidable opponents.