Sound and light don’t propagate well through changes in media. The reason rainbows exist is because light does not travel in a straight line through drops of water, across the full spectrum. Radar is used to sense how hard it’s raining so it obviously gets returns from rain (and through it). But it will depend on the processing they do from the sensors. But just so we’re clear, cameras also work in the rain and snow. I don’t think one is clearly better than others.