[srvmshr]

Depends on the user & use case:

Researchers use LaTeX heavily for papers. It has a learning curve, but once mastered it is very powerful.

Markdown is being increasingly used for code documentation nowadays. `readthedocs`, github pages work well with markdown syntax

Publishers tend to layout professional documents with Adobe Illustrator / InDesign. All the common magazines generally use it, unless they have some custom sauce built-to-order