VitePress powers the official docs for Vue and Vite themselves, which tells you exactly what it's optimized for: fast, clean documentation sites, built on Vite's dev server and Vue's component model. Blogging is something people build on top of it, not a first-class feature of it.
For the wider field of options, see best developer blogging platforms.
What VitePress gets right
If you're already in the Vue ecosystem and want your blog to share a theme, components, and build tooling with a docs site, VitePress is a natural fit — Vite's dev server is fast, Markdown-it extensions give you nice content authoring features (containers, code groups), and Vue components can be dropped directly into pages.
Where it costs you
Blog-specific conventions — post listing pages, tags, pagination, dates sorted correctly — aren't built in the way they are in a dedicated blogging tool; they're patterns the community has worked out and that you assemble yourself using VitePress's theming API. Sitemap generation needs a community plugin (vitepress-plugin-sitemap); RSS needs a similar manual setup; OG image generation is entirely your own build step to wire up. None of this is unusual for a docs-first tool being used for blogging — it's just extra assembly work you're taking on because the tool's real focus is elsewhere.
Where Blogizi differs
Blogizi is a blogging tool first, with none of that assembly required: a Markdown file with frontmatter, published via blogizi publish path/to/post.md, with sitemap, canonical URLs, and per-post OG images generated automatically — see the technical SEO checklist. See blogging from your terminal for the full workflow.
The actual decision
Pick VitePress if: you're building Vue-ecosystem documentation and want a blog bolted onto the same site and theme, and you're comfortable assembling the blog-specific conventions yourself.
Pick Blogizi if: the blog isn't secondary to a docs project — it's the actual thing you're building, and you'd rather not construct blog conventions on top of a tool designed for something else.