Comment below what you think.Personally I would pick Neptunes moon Triton because of its awesome ice geysers!
Wow guys,this has become alot more popular than expected 100+!? Europa and Pluto are winning by landslides
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Europa. One of the four Galilean Moons of Jupiter. Its covered in ice with a liquid water flowing underneath heated by an iron core causing underwater volcanoes. Theres potentially life there and many have theorized humans could set up an underwater research station. I wouldn't put it past the Vex to have an underwater city researching some space/time paradox stabilizers