The total distance between the beginning and the end of the wave. The distance between the source of the wave and where it is received. Both waves and particles. Neither, light is like a fluid flow of energy. The ones whose radial velocity is greater.
All objects appear to move the same way.
They are both made of waves. They travel at the same speed. They have the same energy. They can both travel in empty space. None, in fact we know that light is made of waves, not particles.