When a redesign may be enough
A redesign can work if the site platform is stable, pages are usable, content is close, and the main issue is visual polish or layout.
When a rebuild is smarter
A rebuild is usually better when the site is slow, broken on mobile, hard to edit, missing service pages, using weak copy, or built on a structure that limits growth.
SEO risk during a redesign
Redesigns should preserve useful URLs, improve content depth, add internal links, and avoid deleting pages that already have search value.
The best path
The right answer depends on current site quality, business goals, content depth, page structure, and whether the website can realistically support more leads.