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They both suck IMHO,I have a pretty good library of both for cars and trucks I will never own and don't know why I keep them.I have a ton of them for motorcycles that I can get some info from if I can't get a factory book,but for the most part I try to get a factory manual.
The older Chiltons I liked - mainly due to all the charts and tables on engine building, VIN decoding, etc. Nowadays I don't think there's much difference. WHatever's on sale or available.
I use both if I can get them. The main problem with either that I see is they assume you already know how to..."remove the thingafritz to get to the water pump". Sometimes we don't know what the thingafritz is or how to remove it.
I had this problem with a Taurus SHO. I needed to disconnect the crank sensor to replace the timing belt. 2 weekends, several tools and a couple broken parts like Powersteering reservoir later, I got the belt changed and discovered there was a connector for the thingafritz right near the belt cover. I had tried to remove the crank sensor itself because I wasn't sure what they were talking about. Doh. Live and learn.
A shop manual is very good too, but they often call out for tool number 1245-7/A. When what you really needed was a special open end wrench.