The difference is in the wiring. On a system site, forms feed your CRM, content updates without a developer, dashboards show live numbers, and every page has a job to do. Visitors feel it too, because the experience is fast, clear, and guided instead of decorative.
The test is simple. Once it is live, does the site keep earning its keep, or does it only look nice in screenshots?
We design the scene before we build the system, which means the look and the function are decided together, not bolted on in sequence. A site that clarifies your brand and helps run your business is worth far more than one that just exists.