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#mermaid is the winner for most diagraming, especially inbuilt support in tools like Azure DevOps -- except for C4 diagrams where I still use #PlantUML.
From DanDoesCode: "Mermaid will be fine for most of your needs, but for anything more complex or for doing C4 models, I would fall back to PlantUML. Overall Winner: Mermaid" https://www.dandoescode.com/blog/plantuml-vs-mermaid
@sgryphon
My entire company must use mermaid or PlantUML for all diagrams.. In almost all cases we do not find mermaid suffecient (even though we try) and almost always fall back to either graphviz or plantUML for most things.