"If I could tell a story in words..."

    There are many things that photographs are better at explaining.  I think in general photos or picture are better for just a single moment, a single mood or idea while words are better for sequences and continuous events.  Photographs also tend to be more emotional.  People can read quite a bit emotion into a single photo while words can (but not always) seem more cold and rational.  Words are better for sequences because with a picture you could guess what came before or what it will lead too, and the photographer can even try and imply certain things but the only thing you know for certain is what you see.  With words the writer can explicitly explain what is and will be going on.