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Mars Wins
Mars takes this round
Mars
Mars hurtles through the cosmic void at approximately 24.077 kilometres per second, completing its orbital journey around the Sun in 687 Earth days. This velocity, whilst imperceptible to the naked eye from our terrestrial vantage point, represents a feat of celestial mechanics that has remained unchanged for approximately 4.5 billion years. The planet's surface winds can reach speeds of up to 100 kilometres per hour during dust storms, though the thin atmosphere renders these gusts rather less dramatic than their Earthly counterparts.
Sloth
The three-toed sloth achieves a maximum terrestrial velocity of 0.27 kilometres per hour, a pace that has proven remarkably successful for survival in the rainforest canopy. This deliberate locomotion is not a deficiency but rather an evolutionary masterwork of energy conservation. The sloth's metabolic rate operates at roughly 40 percent of what would be expected for a mammal of its size, allowing it to subsist on a diet of leaves that would leave other creatures wanting. Speed, for the sloth, is simply an unnecessary extravagance.
VERDICT
The planet's orbital velocity exceeds the sloth's by a factor of approximately 320 million.