[dwm] [OT] Which "dragon book": red or green?

Hoi Community,

I want to buy a book about compilers and heard of the "Dragon Books"
which should be the right choice.
Because I dont want to afford more than one, I have to choose:

- Principles of Compiler Design (1977, the "Green Dragon Book"), by
  Alfred V. Aho and Jeffrey D. Ullman

- Compilers: Principles, Techniques, and Tools First Edition (1986,
  the "Red Dragon Book"), by Alfred V. Aho, Ravi Sethi and Jeffrey D.
  Ullman

(I dont want the newest one from 2006.)

Are there any suggestions, which one to take?

meillo