I think its bob from experience, on gilly I found it hard to even get down because the gravity is so low, most of the time I was floating but on bop it was a bit easyer. An interesting point about both moons is that the "follow the retrograde" landing technique does not work as the moons are spinning so fast you actualy travel sideways due to the rotation. also, when I touched the surface of gilly slowly I instantly exploded, anyone know why?