My favorite version of A Christmas Carol is the one done in the early 1990's by the Muppets. Again, I'm totally serious. Okay, it's because Michael Caine did a good job and it was also very warm and funny.
The best acting of Ebenezer was done by Jean-Luc Piccard (you know, what's his name?) in another version. It was the most credible interpretation of the character's dialogue that I've ever seen.