A superhabitable planet is a hypothetical type of exoplanet that could be more suitable than Earth for the origin and evolution of life.
Here's what such a planet would look like:
With oceans that are shallower than Earth's and narrower continents, which means fewer to no deserts.
Green up to the poles suggests a warmer atmosphere which, since the ideal mass for a superhabitable planet would be about 1.2 Earth gravities, would not be caused by greenhouse gases, but only from a denser atmosphere.
The atmosphere should be rich in oxygen, but not much more than Earth has; too much oxygen and fires would become more frequent.
What is not shown in these two pics is a moon, which some consider essential for the development of life due to tides, which "stir" materials along the coasts, and because it is believed that a moon is necessary for a stable axial tilt.