Read the book before you see the movie. Normally the movie won't be as good as the book. Not always the case though. A couple of books and tv series immediately come to mind where the screen version was better, Flame Trees of Thika and Fortunes of War. I am sure there are many examples of tv shows and movies that could be argued, book or movie/tv series.
But let us have a look at songs. With no objectivity at all, this is an ongoing series, for three weeks at least, where I reckon cover versions are superior to the original recordings by the artists who wrote and performed the original. My three examples cover at least three generations.
We will start and end with Aussie performers. This week it is The Beatles versus the Australian band ZOOT performing Eleanor Rigby.