The difference is where the traffic comes from
A link-in-bio page has essentially no discovery of its own. Every visitor arrives because they were already on your Instagram, TikTok, or YouTube profile and tapped the one available link. Its job is routing, and it is measured on click-through rate.
A website is built for discovery. It ranks for queries, hosts pages that accumulate authority over time, and brings in people who have never heard of you. Its job is acquisition, and it is measured on organic traffic and conversions.
Cost and setup are not comparable
A link-in-bio page is live in under ten minutes and is usually free. A website means a domain, hosting, design, and content — realistically days of work and an ongoing bill, even on a site builder.
That gap is why the sequence for most small businesses is link in bio first, website when there is something to say that search engines can index.
When a link in bio is not enough
If you need to rank for "tattoo studio in Guadalajara" or "specialty coffee near me", you need indexable pages with real content. A link-in-bio page will not do that — it is one thin page with outbound links, which is close to the worst possible shape for search.
If you sell a catalogue with dozens of SKUs, need a blog, or want a checkout you control, that is website territory too.