Monograph
The category's standard reference. You don't out-argue legal — you hand them the entry and the citation.
Three studios read the same brief. Each answer is a complete world — the hero and its proof numbers, the redline, and the three tiers. Open any one full size; the point of comparison is the art direction, so the previews render desktop-width.
Most conviction: Redline. It's the only one whose form is the argument — the page performs the exact skill Heather sells, so the proof and the aesthetic are the same object. It also owns the wedge no generic marketing course could borrow. Monograph is the safer, more premium hold if the buyer wants gravitas over drama; Field Guide widens the top of the funnel but asks the most of the copy to prove its rigor.