LaTeX is very rich; other tools support much less

• LaTeX has lots of fancy layouts, but few translates to other formats
• LaTeX inline math: works with all math-enabled formats (LaTeX, MathJax, Sphinx, Markdown, MediaWiki, Confluence, ...)
• LaTeX equation math:
• LaTeX: equation*, equation, align*, align + eqnarray, split, alignat, ... (numerous!)
• MathJax: equation*, equation, align*, align
• MediaWiki: equation*, equation, align*, align
• Sphinx: equation*, equation, align*
• Markdown: equation*, equation, eqnarray*, align* (but no labels)