In the abstract, there’s more of a focus on being general purpose, rather than Lune providing e.g. Roblox file format parsing as a core feature.

Concretely, they’re pretty similar right now, but Lute exposes Luau’s parser which we’re using to build more developer tooling for Luau, including a linter, a codemod tool, and a package manager (and hopefully more in the future).