Scarlet Witch is the most powerful Avenger because she possessed extremely strong powers which were only amplified by her exposure to the Mind Stone. Wanda possesses the powers telekinesis, energy manipulation, and neuroelectric interfacing, allowing her to read minds and transport people into their nightmares.  

In the new show Wanda Vision, she is able to go create her own dreamland. After being overcome with grief after the loss of her husband, Vision, power bursts out of her. She creates the hex and everyone within Westview becomes a part of her dreamland. Within the hex everyone becomes a part of Wanda’s sitcom. After Wanda discovers she can create matter out of nothing she creates her two children and Vision by using these powers. 

In the climax in Avengers Endgame Wanda is able to face off with Thanos, who had all the infinity stones. Wanda is able to crush Thanos with his Armor, the only reason for her losing is her anger. Endgame also showed the Scarlet Witch in the infancy of her powers, she had not yet reached her full potential. Marvel’s Chief Creative Officer, Kevin Feige confirmed that he believed Wanda Maximoff was the strongest Avenger after she almost killed Thanos in Endgame. In the sequel to Doctor Strange Wanda has harnessed her powers and is able to bend reality and kill another multiverse Avengers team. Before this sequel she didn’t know how to handle her rage and the Darkhold, an ancient book of sins, helps her to use that rage to become more powerful. 

While the Scarlet Witch contains some of the strongest powers created in the MCU series and is strongest magically, Thor is  strongest physically. Thor is a God and believed by many to be the most powerful Avenger. He was born on Asgard, home to the Gods, and is the son of Odin. Thanks to Mjolnir, Thor’s hammer, he was blessed with powers over elements such as lightning and thunder. Along with these powers he has superhuman strength, speed, agility, and durability. 

Scarlet Witch continuously becomes more and more powerful throughout the series as she learns to control her powers. Once gaining full control and reaching her full potential she becomes the most powerful Avenger. Although Thor is a strong rival for the most powerful Avenger, Scarlet Witch’s powers outnumber his strength. 

When you think of the strongest avenger Thor comes to mind. Thor is the god of thunder and is 1500-years-old. Compared to the avengers on earth Thor comes from Asgard, a small, planetary body that serves as home to the Asgardians. Because of Thor’s Asgardian physiology he has superhuman strength, durability, speed, agility, stamina, and reflexes as well as a regenerative healing factor and longevity. He can also fly. But, his main power is his electricity generation, storm manipulation, energy projection, and weapon calling. Thor is also able to wield the mighty hammer, Mjolnir, because he is selfless. 

Thor has shown he is the strongest avenger several times. To name a few, first In Thor: The Dark World   Thor was able to defeat Malekith, the leader of the Dark Elves, who had the reality infinity stone and send him back to the Dark World.  In   Thor: Ragnarok , Thor faced off against his powerful evil sister, Hela is the Goddess of Death. In the final battle, Thor realized his true strength and without the use of his hammer was able to strike Hela with an epic lightning bolt. In Avengers: Infinity War.  Thor headed to Nidavellir to create a weapon capable of killing Thanos. To do this Thor had to hold open the eye of the forge for the star power to mold his new ax. Thor withstood the full force of a star. Any other would have certainly died. Another instance was when Thor faced off against Thanos In Wakanda. With his new ax, stormbreaker, Thor was able to battle against the power of all six Infinity Stones to sink itself into Thanos’ torso which was a huge feat.

Although Scarlet Witch has been said to be the strongest avenger with her very strong magical abilities, Thor is stronger. Even though magically Wanda may be superior because of Thor’s physical strength he is stronger. Thor also has a thousand years of experience, unlike Wanda. Close combat fighting is also a weak point in Wanda, so Thor could easily overpower her. With the use of his ax Thor is also able to break through Wanda’s powers. If there was a fight  on equal ground and they both had weapons Thor could defeat the Scarlet Witch. 

To conclude, Thor is the strongest Avenger because of his Asgardian physiology, his unique lightning powers, fighting combat and experience, and his epic weapon. Thor is also a god unlike his Avenger companions. With all of these factors combined this makes Thor extremely strong hence he is the strongest Avenger.