From the set I had for my 74 Volkswagen, the Chiltons was more for an experienced mechanic and the Haynes more for the weekend warrior. The Chiltons had a little more detail but didn't walk you through repairs as well as the Haynes. I found having both to be very useful and would recomend getting both. If you want to see what they look like check you local library, they often have at least one of them there.
There are often Factory Service Manuals on ebay. The new ones for my Jeep are ~$100. The ones on ebay are going for $50 to $60. I just got one recently. One repair that I can make instead of taking it to the mechanic will pay for it. Note, the prices are for the Jeep manuals, I haven't checked other types.
You might even find the Chiltons or Haynes on ebay. I told my wife I wanted the service manual and she bid on a Haynes for me. Got it for $8. Worth it just for another perspective to me.