Also, efficiency of solar power isn't even extremely relevant, except perhaps for very space-limited applications like solar vehicles. Since the input to solar power is effectively free, a better measure is dollars per watt.
Very well said. Unless, of course, one option has a significantly bigger surface footprint than the other.
Cost and sustainability swamp density for sure. Now if these things could be made without conflict materials or "artisanal miners" risking being buried in unsanctioned strip mining.