The first one that came to mind as favorite is the George C. Scott one - I'm pretty sure that's the one with Alec Guiness as Marley. I rmember how Marley moved in this eerily disjointed way, truly unearthly. And it was the first one I saw that emphasized Dickenson's social criticism - maybe the first one (that I had seen) that had the scene where the Ghost of Christmas Present opens his robe to reveal want and hunger. It was an awesome cast and awesome production.
But I'd almost forgotten Kelsey Grammer's Mr. St. Nick. I LOVE that - the whole idea of Santa' son being a debonair bon vivant living in Miami of all places. And Grammer has the presence to make you believe in magic. So that would be second.
Third is a new one this year (I think) that I laughed all the way through - the Tom Arnold one. It's a riot. If you haven't seen it, watch for it. Completely turns the story upside down.
Salmon leap from the womb of the white sea you look on; they are calves, they are lambs of good color, in peace without slaughter.