As the nexus of the multiverse, the Scarlet Witch is incredibly powerful. She has powers that stretch across multiple universes and she is one of the most powerful heroes in the MCU. She has the ability to transform, create, and manipulate energy as well as metamorphose into different forms. This makes her very powerful, but it also means that she has a lot of potential to be abused. Despite having such immense cosmic power, the Scarlet Witch has a very human side to her that helps her overcome some of her weaknesses.
It was revealed in Avengers: Endgame that Scarlet Witch has been using her abilities to destroy the Infinity Stones. She managed to scare Thanos into ordering his army for rain fire, indicating that she’s very strong and can hold her own in a fight against the Mad Titan.
Even though Brie Larson’s Captain Marvel is a powerful cosmic hero, she doesn’t have as much raw physical strength as the Scarlet Witch. However, she’s more durable, can fly into space, and has a faster healing rate than most humans.
As for Wanda Maximoff, she’s one of the most powerful magic wielders in the MCU and is highly advanced with Chaos Magic. Her reality-warping abilities allow her to take on opponents that are far more powerful than she is. Plus, her telekinesis is capable of deforming and killing enemies, making it very hard to counter her attacks.