So I bought the new 75th anniversary edition, now I am hearing that the older non revised version is better. Should I sell this and buy an old copy?
Joy Of Cooking Revised vs Original
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The 75th anniversary edition tries to return to the accessibility and friendliness of the 1931-1975 editions, but still with some updating over the 1975 edition. In other words, a compromise between the old editions and the drastic 1997 overhaul (edition history: http://en.wikipedia.org/wiki/The_Joy_of_Cooking)
_Joy_ has been popular over the decades not only because the recipes were accessible, but also because it served as a comprehensive reference book for the home cook. I doubt the 1975 or earlier editions will do a better job of that than the one you have, but there should be plenty in used bookstores if you want to see what they're like.
Do you like the edition you have? Do the recipes make you want to cook?
I have the maligned 90s version. I think it's pretty good but is more a product of its time. Somewhat simplified and with shifts towards lower fat and sodium. It's just as easy to use as any other version really, but people's favorites were tweaked or deleted.
I also have the latest version which I concur is more flavor oriented with the fat returned as well as the favorites.