1.
You use ~ to indicate that two figures, ideas, or choices are opposed.
Only 18.8% of the class of 1982 had some kind of diploma four years after high school, ~ 45% of the class of 1972.
...bottle-feeding ~ breastfeeding.
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2.
Versus is used to indicate that two teams or people are competing against each other in a sporting event.
Italy ~ Japan is turning out to be a surprisingly well matched competition.
= against
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