They might be "better", but Mermaid works offline (there's a cli) which makes it a much better choice, along with PlantUML. An online tool might be good for making one off things you know you won't ever need to change, but my main use case for these tools is documentation which, naturally, needs to change over time.
I think almost all of the tools I listed are offline. They do load in browser, but from there they don't use server to render diagrams. Some aggregator tools like Kroki is of course not offline though.
