In the beginning there was the Betamax and it lost to its cheaper counterpart; the VHS. LaserDisc never really had a direct counterpart but did lose to VHS, and later DVD.
The most recent content delivery platform battle came in the form of the HDDVD vs. Blu-Ray. Often the victor was decided by which was cheaper and whoever the porn industry put their support behind. An article by Jeff Grubb over at venturebeat.com discusses the latest battle; virtual reality devices.