I'd say LLB is the "standard", Dockerfile is just one of human-friendly frontends, but you can always make one yourself or use an alternative. For example, Dagg

I'd say LLB is the "standard", Dockerfile is just one of human-friendly frontends, but you can always make one yourself or use an alternative. For example, Dagger uses BuildKit directly for building its containers instead of going through a Dockerfile.