Short answer: standard with Divi 5, the latest and fastest version.
Why this choice: Divi 5 saves pages as blocks instead of shortcodes, which noticeably improves loading times and maintainability. And because we work with a single builder, we know it inside out — including the pitfalls.
If your current site uses a different builder, we evaluate the best starting point on a case-by-case basis. Sometimes continuing with the existing build is fine; other times, it costs more than starting over. You will hear this from us before anything is built.
In any case: you hold the key. WordPress is not a subscription platform where your content is locked in, and you can move your site to another provider without having to start from scratch.