GURPS Conan still slams to this day. The system is so precise and yet so simple to play and the setting guide truly reveals the Hyborian Age.
TBH S&S isn't about the system per se. It's about the characters. They should be morally-gray opportunists and as such the "heroic fantasy" often presented by many systems falls flat. While he sometimes performed heroic actions, Conan of Cimmeria was anything but a hero.
I mention GURPS because the system's made a semi-resurgence in 2024 .... and the great majority of fantasy ttrpgs are terrible.