If it’s a PbtA please expand on your system of choice!
I’ll start:
I really enjoyed Sexy Battle Wizards, but I think The Witch is Dead speaks to me more. I like player characters just being little weak dudes and struggling against normal stuff. (both of these are free by grant howitt and 1 page of rules)
I also enjoyed rude detectives, it has a surprisingly juicy dice system for a game that’s just 4-5 pages. It’s themed around child detective stories.
PbtA I like magpies stuff, like avatar and root, but my favorite until now was Fellowship 2e I think. Just so extremely versatile, and it’s a joy to give a lot of narrative control to players.
Last one is kinda cheating: my current favorite game is rules light within it’s genre. 13th Age is the easiest ‘dnd’ I’ve ever seen, and the amount of dumb rules and bookkeeping it prunes has reinvigorated 20f games for me! But compared to other games, it’s still a bunch of rules of course.
Tricube Tales. It’s the easiest game I’ve run, and strikes a perfect balance between rules lite narrative shenanigans and a traditional roleplaying game. Uses an easy to manage 1-3 pool of d6s, and all the GM has to do is pick a Trait (Agile/Brawny/Crafty) and assign a difficulty to the challenge (most of the time it’s 5). Character creation is pretty freeform, with PCs getting Fate aspect-style Perks and Quirks. You can run just about anything in Tricube Tales. It’s a real joy.
I’m also big into FIST ULTRA Edition, a game about paranormal mercenaries set during the cold war. Inspired by Metal Gear Solid and Doom Patrol, FIST is based on World of Dungeons, so it’s a 2d6 system, sort of like PbtA with only a “defy danger” move. The heart and soul of the game are the 200+ Traits, which are a sort of combination half-class, feat, starting gear, and attribute score adjustment. When you make your mercenary, you get to pick two Traits, and the ensuing combination is always fun.