Mars gets all the love. When you hear somebody, whether a scientist or a civilian, talking about another planet in the Solar System, invariably they’re talking about Mars. Mars used to have water. Mars might have life. Mars Mars Mars. Enough, I say!
That probably needs some qualification. Obviously Mars is nearby, it has a 24-hour day, and it’s thoroughly habitable by the standards of, say, Mercury. It should hardly come as a surprise, then, that there have been a lot of scientific missions to Mars, and additional ones are being planned. It’ll be the first planet in the Solar System other than Earth to have a human presence.
However, that doesn’t excuse the favoritism that it gets in fiction. In fact, Mars has a lot of disadvantages for certain activities: it’s farther from the Earth than Venus (on average), it gets about a fifth of the solar energy that Venus does, and it would very likely require more energy to terraform, since it has no atmosphere or active geology. So really, where’ the love for Venus?