As stated, the aneutronic difference is key. But even key-er is cost.

The projected FF costs, even doubled or tripled, simply render all other alternatives “economic roadkill”, to quote my own favourite phrase. Renewable, conventional, nuclear, whatever. There is nothing in the ballpark, the race, the picture. Combined with dispatchability (responsiveness to demand), distributed installation (siting near demand, wherever that might be), lack of waste stream, and safety (breakdown results in a stopped generator, period), and the only barrier to selling it is breaking through incredulity that anything could be that good.