Never even heard of the 2001 version. (And I've seen a lot of obscure versions.) How does the George C. Scott version rate for accuracy?
The 1970 musical Scrooge gets extra points from me for Alec Guinness as Marley, and Ebeneezer's brief visit to his own personal hell. Although I think someone involved in the production was projecting their personal kinks just a tad...
The Mickey Mouse version gets a little disturbing, since the Little Pigs are in the cast, yet a roast pig is seen in a holiday feast. What the hell?
The 2001 version is an animated one most notable for a bunch of additional subplots (including two mice) and Nicholas Cage as Marley.
As for 1970, I like the soundtrack, but not the hell scene. Also, I find Finney a tad goofy, as well as the Ghost of Christmas Past.