If only those two choices, Chiltons.
Haynes always has too many errors, and for something that has been in print since 1989, that is supposed to cover, in our case through 1995, should be completely error free, with cross references for model year changes. I have a Haynes a customer threw in our recycle bin, that showed the wrong point to connect to for home diagnostics, and it fried the CPU.
If no other choices, absolutely a FSM is the best choice.