We think basically you watch television to turn your brain off, and you work on your computer when you want to turn your brain on.
Reams of academic studies over the decades have amply confirmed television's pernicious mental and moral influences. And most TV watchers know that their habit is mind-numbing and wasteful, but still spend most of their time in front of that box. So turn your TV off and save some brain cells. But be cautious, you can turn your brain off by using a computer also. Try and have an intelligent conversation with someone who plays first person shooters for eight hours a day. Or auto race games, or role-playing games.