For native Linux games, and not sure if best, but the games I played most:
Stardew Valley
Slay the Spire (tbh. only on the Steam deck, and I did not know it was Linux-native)
Supertux
Supertuxkart (the last two are tbh not great, but they are open source and easily available, so I always play them)
Sauerbraten (didn’t play for quite some time though)
However, I also use(d) wine or proton to run some games on Linux, for example Grim Dawn, Anno 1602 (unfortunately doesn’t run any more - and after they did not deliver the promised Multiplayer for 1503 I decided to not buy any successor, so unfortunately no Anno for me any more) and Guild Wars.
Even though I mostly play them on Windows, I tried out Satisfactory, Divinity: Original Sin 2 and Guild Wars 2 on Linux and they seemed to work well.
For native Linux games, and not sure if best, but the games I played most:
However, I also use(d) wine or proton to run some games on Linux, for example Grim Dawn, Anno 1602 (unfortunately doesn’t run any more - and after they did not deliver the promised Multiplayer for 1503 I decided to not buy any successor, so unfortunately no Anno for me any more) and Guild Wars.
Even though I mostly play them on Windows, I tried out Satisfactory, Divinity: Original Sin 2 and Guild Wars 2 on Linux and they seemed to work well.