In the movie "Avengers: Infinity War," it is difficult to determine a single most powerful Avenger, as each character showcases their unique strengths and abilities. However, I can provide an analysis of some of the most powerful Avengers in the film:

1. Thor: Thor is considered one of the most powerful Avengers in "Infinity War." He possesses incredible physical strength, durability, and the ability to control lightning and storms. In the movie, Thor demonstrates his power by withstanding the full force of a star's energy, surviving the power of the Infinity Gauntlet, and even managing to injure Thanos with Stormbreaker.

2. Scarlet Witch: Wanda Maximoff, also known as Scarlet Witch, possesses immense telekinetic and reality-altering powers. She can manipulate energy, create force fields, and has the ability to destroy the Mind Stone. In the movie, Scarlet Witch single-handedly holds off Thanos for a considerable amount of time, showcasing her incredible strength.

3. Doctor Strange: Doctor Strange is a master of the mystic arts and possesses the Time Stone. He can manipulate time, create portals, and use various spells. In "Infinity War," Doctor Strange engages in a battle of wits with Thanos, utilizing his magical abilities to create duplicates of himself and employing the Time Stone to foresee the future.

4. Captain Marvel: Although Captain Marvel does not appear in "Infinity War," her introduction in the Marvel Cinematic Universe (MCU) establishes her as one of the most powerful characters. In "Avengers: Endgame," she showcases her immense strength, energy projection, and invulnerability, making her a formidable force.

It's important to note that the Avengers work as a team, combining their abilities to take on powerful foes. Each character brings their unique skills to the table, making them a force to be reckoned with. The power dynamics can vary depending on the situation and the specific threat they face.