Two factors dominate the morphologies of these craters: material strength and gravity. The bowl-shaped morphology suggests that the topography is supported by the strength of the material, while the topography of the basin-shaped craters is overcome by gravitational forces and collapses toward flatness.
Strength of material and gravitational forces dictate the forms of these craters. Bowl-shaped craters are supported by material strength, whereas basin-shaped craters collapse under gravitational influence and become flat.