Answer:
Kepler 277b or Mars
Explanation:
Kepler planets have similar gravity, habitat and atmosphere like earth. Which makes them ideal to settle onto by a dominant-intelligent species
Mars on the other hand, assuming you are an Earthling, is quite near than a Kepler planet 5 lightyears away from Earth.
living on mars is trecherous but possible. Main factors of it are:
Radiation because of a weak atmosphere
Limited yearly travel window
toxic atmosphere
lower gravity
Terrible sandstorms
and if something goes wrong, it can certainly become a life-threatening situation for the inhabitants
