Page-level job
Landing pages, service pages and custom one-off layouts are classic page-builder jobs.
Template-level job
Blog posts, product pages, archives, headers and footers are usually better solved with reusable templates.
Why the distinction matters
If you manually duplicate the same header or post structure across dozens of pages, you create maintenance debt.
Divi example
Divi combines its Visual Builder with Theme Builder assignments so the same editing model can be used for individual pages and repeatable templates.