ConstructionElon Musk's vision of a Martian city (top) and an artist's concept of Bezos' O'Neill space colony (bottom). Bezos' space stations could be built to resemble Earth more easily — no massive terraforming necessary. "If I had to pick a billionaire's vision of the future, I would definitely go with Elon Musk's Martian colony," Gonçalves told BI. That's why Rachael Seidler thinks Musk's Martian cities are a better bet than Bezos' space stations. Joe Raedle/Getty ImagesThe majority of experts BI spoke with agreed that Musk's Martian colony is more feasible than Bezos' enormous space stations.

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Persons: Elon Musk, Jeff Bezos, Musk, Bezos, he's, O'Neill, Anthony Longman, Longman, I'm, Rebeca Gonçalves, Gonçalves, Elon, Rachael Seidler, SEBASTIAN KAULITZKI, roaches, we've, Adam Watkins, It's, Watkins, it's, Joe Raedle Organizations: SpaceX, Origin, Business, Elon, YouTube, Space Station, NASA, Wikimedia, University of Florida, University of Nottingham, Elon Musk