I screwed up; I thought the poll was moon colonization versuses colonization on the Martian planet. I meant to vote for Man walking on Mars...

In terms of colonization, though... I think it'd be a dead heat between Mars and the Moon. You figure, the Moon is only a few days travel from Earth, so if anything went wrong (hypothetically) we could evacuate people within a week or two; whereas if we needed to get someone off of Mars...well, they'd be SOL, since it'd be many months' journey.

On the other hand, we probably have to introduce water to the Moon, whereas Mars shows more potential to sustaining life (at least, life would be able to find a drink!)