Slayers is fun, simple, and quick to play. It's set in an endless city full of monsters, strange people and places, and bizarre worldbuilding*. The game focuses on modding, toolkits for homebrew are available for free, and there's tons of homebrew by fans and by the creator, meaning that while the base game has 4 (6 technically) jobs, you can simply look around the tags for this game to find tons of fun classes and variant rules to customize your trawl through the bizarre city!
Slayers is quick to learn, fun, and easy to mod, I honestly have pitched it as "what WOTC wants you to think 5e is" and i don't think that's entirely wrong, its fun go play it
*My best example of this is the fact that canonically guns and cowboys come from a nightmarish hell dimension of pain and torture and yeehaws