Let's get this going.
What's your favorite OSR?
Ones I have, * means played.
OD&D * AD&D * Basic Fantasy * Castles & Crusaders Old School Essentials (OSE) Hyperboria OSRIC Advanced Labyrinth Lord Swords & Wizardry * Pathfinder 2e Dungeon Crawl Classic Tunnels & Trolls
My go to is AD&D...
I grew up playing B/X and then AD&D. Right now, I'm running Swords & Wizardry with a couple of house rules and it's really feeling like my forever home.