Without a question - A Christmas Carol.. Black and White version with Alistair Sims
I hear that when it was written back in the 1843 Dicken's use to read it every christmas. In the 1900's Barrymoore then read it on the radio every eve until the late 1930s when hollywood did the first version of the book. At the time they wanted Barrymoore to play the part, but he got into an accident on the last film so he suggested Reginald Owen's.
The rest is history.