Presumably the most appropriate metric in the end is (likely) cost per kilowatt/hour of generated electricity. That’s what really ultimately matters, and that captures all the “overhead” that tokamaks and other similarly-sized approaches have (e.g., large capital investment, dealing with radiation from neutronic reactions, inefficiencies in using radiation to heat fluid to boil water to create steam to drive turbines to turn generators, etc. etc. etc.).
