>>10689773Mars Is incapable of holding a decent atmosphere and is relatively tiny.
(although for some reason the images show it being sufficient to hold dust to the point of the atmosphere scattering as much or even more light than on earth creating a much lighter appearance of objects in the distance on photos ... /x )
At atmospheric pressure/altitude close to 1 bar Venus is also close to 20°C.
This creates the option of flying cities (blimps etc.) with no need of holding pressure in a vacuum as basis for reducing the atmosphere cooling down the surface in the long therm.
Which is the only place I'd see a potential large scale far future settlement option.
If we are only looking for an outpost Mercury is certainly an option but I see little advantage in choosing a hot medium gravity rock in a vacuum far away (mercury) over a cool low gravity rock in a vacuum in close proximity (moon) for launching spacecraft.