It really depends on your style of learning.
Some learn better by hands on (kinesthetic), visual, or auditory.
In my opinion I enjoy television, because I can visually see whats being taught while listening to what they are saying. For instance the History channel one of the only TV channels I watch I learn a lot from it. While on the other hand books tend to make me sleepy, and want to skim through the information; which can make me lose out on a lot of useful facts.
I believe both Television and Books can provide a great education, but to have only one source for your information is just cheating yourself.