VHS vs. Beta
VHS and Beta are pretty much gone now, but the two technologies sparked the first battle for the living room -- specifically, home movies. VHS, of course, won. It was the machine that launched a thousand rental stores across the country.
But nothing lasts forever, and VHS itself became victim to the DVD, which, in turn, is succumbing to streaming movies. Meanwhile, rental stores are getting torn down as quickly as a bad VHS machine chewed up the edges of a tape.