The widescreen or the full screen (1:33:1). As I understand it, the widescreen DVD of this film is a matted widescreen that cuts off the top and bottom of the movie picture. If this is correct, one certainly it seems to me would be better off with the full screen version. Looking at IMDB, this film appears to have been original filmed in 1:33:1 aspect but was meant to be seen at 1:85:!? Which do you think is best? I certainly want to add this unforgettable classic to my collection but am wondering which version is best to get?
Sounds like you're not familiar with the technical reasons for this.
Basically, look at a 35MM negative. It's at an aspect ratio of 1.33:1. Technically, they can use an anamorphic lense to distort an image at whatever ratio they want onto the negative, then use an equivalent anamorphic projector lense to put it out correctly on projection. But frequently, for technical reasons and because of flexibility, they just shoot at 4:3 fully intending for a big chunk of the top and bottom of the image to be lost. The director and DP when setting up shots do so with this eventuality in mind, meaning the opened up version is a destruction of their intended visual constructions.
So, go for the widescreen version. If you're a really big fan of a film, sometimes it is interesting to see the opened up version for comparison (and occasionally you can spot bits of equipment in the frame in the opened up versions, like cables or a boom mic), but in terms of artistry, you'll always find the widescreen version preferable.
BTW, the flexibility I referred to - the advantage of shooting at 4:3 today is that if the framing is slightly off, you can move up or down a bit (taking more/less of the top/bottom) in the cropping to adjust it, something not possible if shooting anamorphic.