Jason Clapham, the creator of this tasty aperitivo, considers the Chorus Girl "A far more decadent drink than its prehistoric ancestor, the Martinez."...
This vermouth category is intended to represent a style of rosso vermouth that's a bit more full-bodied than Dolin Rouge. However, if that's what you have, then I'd give it a go.
Presently, it sits between the two - e.g. Cocchi Vermouth di Torino sits between Martini Rosso ("130g/L sugar, lightly/unaged") and "Full-bodied sweet (eg antica formula)". However, I'm aware that our vermouth categories need addressing, and I'm working on this ahead of my vermouth seminar at Tales this July (2024).