Being from Portugal, and having seen both films, no wonder why real-life Soror Lucia at the time didn't like the 1951 movie... it's lyrically beautiful and most of the movie was shot in Portugal, but it doesn't make up for the reality that it was. At least, the actors tried the best they could for making a nice movie.
The 1997 movie (called "Fátima", and originally conceived for the television broadcasting) itself, being Portuguese and made there, gives a much better accuracy of what really was the miracle of Fátima, the destiny of the chosen Lúcia, Jacinta and Francisco; and even including secondary stories (wondering if that secondary story was real or not). The parting of Jacinta and Francisco, while is not included in the 1951 movie, it is in the 2001 movie, with great drama.
However, both are two must-see movies...;)
You'll really believe on the miracle which conquered millions of people in Portugal :)