Venus would be more compatible for humans from a gravity perspective, probably the only orbiting body that would be, I think. But that atmosphere is brutal, not sure there is any viable plan to 'correct' it. Mars at least is surface survivable, though without a magnetosphere I'm not sure it could ever have a breathable atmosphere even if we could raise enough dust to at least give it enough pressure so you could go outside without a pressure suit. Shielding Mars from solar winds is at least technologically feasible, if impractical to do so at the moment.