My opinion for what it is worth.
I have found that Haynes is a better book than Chilton. Haynes tends to stick with the specific car you bought the manual for. Chilton tends to try to cover too many models in one book, and the result is that their coverage is lacking in detail and not as specific to your car. I also think that the Haynes is written better for the DIY people.
If you really want to get into some of the better stuff, Glenn Mitchel or Motor also publish excellent repair manuals second only to the factory service manuals.
These days, they want to put everything onto DVDs or CDs. I find that not to be useful since I usually do not have a computer available where I am doing repair work. Then there is that issue of what is on a screen as compared to a printed hard copy.