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Older editions of which books were better than the new ones?

When choosing some mathematics book to study, is it always the case that one should look for the current edition of the book. Are there any examples when the older edition of some book is clearly b...

We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. Ian Stewart's Galois Theory, 3rd edition, is sometimes harshly criticized for ruining a great book, by (1) doing everything over the complex numbers first (leading to some long-winded proofs), and (2) being full of typos. $\endgroup$2$\begingroup$This kind of thing is very subjective, but in my opinion the third edition of Computability and Logic by Boolos and Jeffrey is better than the fourth, at least from the point of view of someone interested in the advanced topics (as opposed to a student encountering the material for the first time).

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