Reading a great book will scratch your mind for your lifetime- watching a great TV Show will amuse you for some years.
ps. While I’m currently cinephile and once upon a time I was bookworm, I think that a great movie and a great book may have similar impact on you, a great TV Show doesn’t much equal to them, may be only greatest TV show could be but those are very very rare.
pps. Another thing is there are many many thousands great books, few thousands great movies and only few hundreds great TV Show (more or less but may be you can get the point).
ppps. Answered on Quora