I'll give what I like best from the directors I like, not sure if I could distinguish between #s 5-20 meaningfully
Tarkovsky—Nostalghia
Lynch—Mulholland Drive
Mamet—House of Games
Guadagnino—Bigger Splash
Antonioni—Blow-Up
Welles—Other Side of the Wind (sorry lol)
PTA—Punch-Drunk Love, Phantom Thread
Almodovar—Skin I Live In, Women on the Verge of a Nervous Breakdown
Robert Altman—Nashville, Short Cuts
Spielberg—Close Encounters
Kubrick—Barry Lyndon
Malick—Days of Heaven, Thin Red Line, New World
Herzog—Aguirre
Stillman—Last Days of Disco, Barcelona
Wyler—Ben Hur
Some honorable mentions for Dogtooth, Woodie Allen's Sleeper/Radio Days, and Vivien Leigh's Cleopatra