What is your favourite moon(s) in the Solar System?

Whether it's the most interesting, the most beautiful, or the strangest one for you, which is, in your opinion, the best moon in the Solar System?

Could it be the Earth's own moon, being so large in comparison to the size of our Planet? Perhaps little Phobos and Deimos of Mars? The Galilean moons of Jupiter? Titan, Saturn's largest moon and the only one in the Solar System with a thick atmosphere? Farther out, you have the moons of Uranus, Neptune, and Pluto...