Which place in our solar system is the most fit for terraforming?

Far in the future technology has evolved to the point that humanity is able to try and terraform something in our solar system.

The moon is out, since it's too close to earth and therefore to risky, since we don't want any debris raining down on our home (assuming we use techniques like dropping comets and such). Also, all governments are already invested with industry on it and don't want that destroyed.

Mars is out, too, because we already established colonies of domes there and no one wants these destroyed / or unusable for a time either.

Which other place in our solar system is most suited for terraforming?

There are a lot of Saturn's and Jupiter's moons mentioned in the general listing of possible places, or Venus, but I have not been able to find an answer of the "most fit" or "least work to do".

Edit: This question aims specifically towards terraforming and not only colonization.

Edit II: And this question excludes earth as an answer as well. In my understanding the word terraforming (="to make like earth") implicates that earth already exists. A good point that there is room for improvement, though.

posted about 5 years ago

Backup Plan‭

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