The main advantage over Minecraft is unrestricted modability. Luanti is just the voxel engine, you can run hundreds of different “games” on top of. Aside from the obvious mining and crafting types of games (including VoxeLibre which is a direct clone of Minecraft) there are also games with completely different gameplay - platformers, arcade etc.

Also - free, open source, community run. Not owned by Microsoft. So that’s nice.