Fabric is a lightweight, experimental modding toolchain for Minecraft. It allows mod developers to create mods more easily and efficiently, offering flexibility and compatibility with other mods. Fabric aims to provide a streamlined experience for both developers and players.
Additionally, Fabric provides powerful APIs and tools for modders to enhance gameplay, introduce new features, and optimize performance. With its active community and regular updates, Fabric remains a popular choice among Minecraft enthusiasts.
If this is not your style however, and you want to play with plugins or mods, then you can use Forge for modding, if you want to use plugins then Paper is a stable option. If you don't want to use mods or plugins then Vanilla is the best option.