Direct answer
Build a landing page first when you need to test one offer, campaign or audience quickly. Build a full website when buyers need trust, service depth, proof, navigation and ongoing search visibility. A landing page validates a focused decision; a website supports a broader business presence.
Why it matters
This answer connects website design to the buyer decision the page must support. A useful website is not only a layout; it is a path through clarity, proof, trust, calls to action, tracking, launch risk and maintainability.
What to check
- What must the visitor understand, believe and do next?
- What proof, copy, page structure and tracking support that decision?
- What will make the site easier or harder to maintain after launch?
Common mistake
Treating a website as a design surface before the buyer path, content, proof and post-launch responsibility are clear.
Caveats
Low caveat risk: suitable for publication from the available source pack, but still avoid pricing, guarantees, unsupported service promises or claims not visible in the linked public ecosystem.