Early betamax could only record about an hour per tape, later doubled to two hours. VHS started at 4 hours, and went to 6 pretty early. Later on they both made longer tapes, but at the time that VCRs became common the VHS ones held 3 times as much.
So for VHS, 2-3 tapes could hold an entire season of a 30 minute show, a single tape could hold a trilogy of movies, and they also were a lot cheaper. Betamax cost a lot more and you’d have to buy, store, maintain, and switch out 3x as many tapes.
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