Alright, we have our 16 candidates, now it's time to match them off one by one and find the favorite SF Novel of the collected Escape Artist community! And to start off, we have a Mars vs. Mars showdown! Both from the classic age of SF - one novel (well, series of collected shorts) about colonizing mars, and of course the native Martians encountered there. The other about a human boy raised on Mars by Martians coming to Earth.
Mars was a classic setting for SF stories - not only was it close by, but seemed to have signs of habitation... all those well organized seeming canals that must be full of water. Not quite what the current rovers are sending back pictures of, though the reality is still pretty fascinating, despite seeming to lack the four armed green giants of Barsoom, or the tripod tanks of War of the Worlds. Of the final sixteen books, these two and War of the Worlds deal with Mars, though all in very, very different ways.