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I have both.I find that the wiring diagrams in the newer Hayne's are more beginner friendly,but they do leave alot of stuff out.Now,the older Hayne's manuals are really good.
I was raised on Chilton's,so I prefer them,but I see alot of stuff missing in their books too.As somebody else said,what one leaves out the other has,so I just got both.
I just picked up a new Haynes to replace the one that is still missing after I moved and was really disappointed in the wiring diagrams. They're not anywhere near as detailed as the old manual. I may look for a Chilton's and see if the diagrams are any better, or get off my duff and find the old Haynes manual.
The older the manual,the better it is.That's what i've concluded.My dad has an 8th gen only Chiltons manual from 1992 and it was huge.I have the newer 8th and 9th gen combined Chiltons manual,and it's half the size of my dad's 8th gen manual from 92.
Age is definitely a big factor.I have two of the Haynes manuals for 80-96 that look exactly alike.One is older than the other.I never noticed until I started to look,but the older one has alot better wiring diagrams than the newer one.Yet the books look the same on the outside.I don't know if Chiltons and Haynes have gotten lazier,or if printing and publishing costs have risen,or if they just think we're all stupid and can't figure out the advanced stuff so they just make it so kindergarten children can understand it.Whatever the reason,it's a shame.
I prefer to get the factory shop manuals, way more detail then any general repair book. I think it was around $85 for a set of three books. My next choice would be motors.
IMO: the 'repair' manuals are a waste of hard-earned money. They are not complete and sure 'nuff what was left out will be exactly what you need to know. ebay has Ford Factory Service Manuals for sale all the time and a little time spent shopping will be worth it. The Ford manual I get the most use out of is the Ford EVTM (electrical/vacuum/troubleshooting manual) If you need to know something about either of these systems, this is the manual to have.
heck honestly with access to this forum you don't really need a manual if you have a working printer. any thing you need to know some one on here has already had to deal with and by searching or asking nicely you will get the answer that you need.