GGB By operating model, not styling. Ask whether the format earns more than one daypart, whether labour scales sub-linearly with revenue, whether it survives a delivery-commission change, whether its digital layer moves margin, and what experiment would kill it cheaply. Every concept is a hypothesis until a real experiment has been run against it — and anyone promising a format will win is selling.
From Three Restaurant Concepts Built for 2027 — Not Recycled from 2017 — the full reading, with the method behind this answer.