Gravity slumping is only visible on airless worlds with timescales of billions of years. Note that large features, such as impact basins or extremely large impact craters can not be eroded away even after 100's of millions of years. Such large features on the Earth were eroded by tectonic activity, i.e. the crust was recycled by plate motion such that those ancient impact basins are gone. Old surfaces are heavily cratered. Young surfaces are dominated by tectonic and erosion effects.
Tectonic activity determines the global surface features of a planet.
Erosion to varying degrees dominates the later stages of surface feature evolution.