Summary: The Jovian moon Callisto is the best body in the solar system to consider for future human colonization.
Reasons: It's got a relatively high surface gravity.
It's unique in the solar system among large objects that it is undifferentiated, meaning there will be large mineral deposits at or near the surface.
It is outside Jupiter's massive radiation belt, which for reference does envelop the larger moon Ganymede.
There is water ice easily available on the surface. This would provide not just water but also oxygen.
Close proximity to the asteroid belt and the trojan asteroids around Jupiter, thus any asteroid mining efforts would have essentially limitless supply.
And the future is in orbit around Callisto, going to the surface to mine minerals and collect ice.
UmbralRaptor t1_ja8n4ul wrote
Assuming we get extremely good at building habitats, maybe.