Hi Tom,
I own both sets, here is my take. You can't go wrong with either set, they are both superb, indispensable reference works for the serious collector. If you are a book kind of guy, as I am, you will like the green set better. If you want to pull out a single volume you can do so without having to lift the whole case out of the shelf, which you have to do with the poorly designed slip case of the red set. When you open a green book it stays open and lays flat, not so with a red book. The green books are printed on better paper and have larger and clearer illustrations. The red books are said to have many updates and additions, in two years I have only found one, an added photo spread.
The big plus with the red set is the searchable DVD which comes with it. If you are a computer kind of guy you will love it. The photos come in loud and clear and you can zoom in. However, since the DVD is available separately for about $40.00, it's not all that big a plus.
Norm
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