Near as I can tell, no one has yet gotten to the point of having a somewhat plausible guess at cost/watt for fusion, so it’s a moot point.

All reactors are still at best early scientific experiment level, and have been for some time.

Fission exists now, and we understand the economics. With all the political friction and the like, the west basically builds no new plants.

So we’d be comparing ‘no clue it’s even possible to build a plant’ to ‘expensive and generally not building new ones’