They are not really competing for the same material. Fission smashes neutrons into big atoms to make them smaller, fusion smashes small atoms into each other to

They are not really competing for the same material. Fission smashes neutrons into big atoms to make them smaller, fusion smashes small atoms into each other to make them bigger. Both work by making atoms of the more stable medium-sized variety, and extracting the energy of that process. But yeah, looks like commercial fusion reactors are getting closer.