The practical difference
If you have a built app and need a reliable deployment workflow, Vercel is the natural choice. If you have an HTML file that someone needs to click now, HTMLShare removes the setup step.
For AI coding workflows
AI tools often produce standalone HTML, CSS, and JavaScript before there is a repo or framework decision. HTMLShare fits that early review loop, while Vercel fits the moment you decide to ship the project as software.
A three-way decision guide
Choose HTMLShare for a fast review link while the page is still being checked. Choose GitHub Pages when the site is a repository-backed static site that should stay connected to Git history. Choose Vercel when the project needs a production framework workflow, builds, server functions, environment variables, or other app operations.