If it's swimming versus downhill, that would be swimming. However, if it's swimming versus cross country, easily, cross country.
What muscles do you need most for cross country skiing? All of them. Swimming neglects the calf and extensor (forearm) muscles, regardless of swimming style. In cross country skiing both your calves and forearms will get a workout, and the only part of the body not worked is the neck. However cross country skiing involves every single muscle in the human body.
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