* Fight Club (1999): This cult classic features Pitt as Tyler Durden, a charismatic and violent soap salesman who leads an underground fight club.
* Snatch (2000): This action comedy features Pitt as Mickey, a bare-knuckle boxer with a gambling problem.
* Troy (2004): This epic historical film features Pitt as Achilles, a legendary Greek warrior who fights in the Trojan War.
* Inglourious Basterds (2009): Though not primarily a fighting movie, this WWII film features Pitt as Aldo Raine, a Jewish-American lieutenant who leads a group of soldiers known as the "Basterds" who kill Nazis.
* Fury (2014): This war film features Pitt as Don "Wardaddy" Collier, the tough and experienced commander of a Sherman tank crew during World War II.
* Once Upon a Time in Hollywood (2019): This historical drama features Pitt as Cliff Booth, a stuntman who gets involved in a fight with a group of hippies.
It's hard to pick just one, as each of these films showcases Pitt's fighting abilities in different ways. Which one you'd consider the "best" depends on your personal preferences!