You won't escape math in either program, but Earth & Space Science is less of an exercise in crazy math. Instead you'll be learning a broad range of physical sciences. If the frequency of pulsars, etc., is your thing, sharpen your pencil for writing the equations of physics/astronomy. If you're more interested in planetary atmospheres, etc. aim for E&SS. But you can go either direction from either program, because the real split between the two happens in grad school. By the way, you're heading into a field where even the assistants have an MS, if not a PhD.