I'm building a 69 Chevelle and don't know which wire setup to use to rewire the car, I was going to use Painless but have been told that Autowire is better.
Painless, Ron Francis, and our products are all good quality products. The thing you need to decide, is what the project is all about. If it is mostly or all original, our Factory Fit harnesses are the only way to go. Every connector, lamp socket and clip is installed onto the harness and they are completely built and taped. It is a true "plug and play" experience. If you have an HEI distributor or Internally regulated alternator, those mods are no problem. These harnesses cost a bit more as we have done all the work for you. You simply route it and plug it in.
If your car is a highly modified one, now we need to start talking about the other products mentioned early on. The main difference with our Classic Update and the Painless or Ron Francis unit is the completeness of the products. Our Classic Update kits are engineered for YOUR vehicle, period. Most every connector, lamp socket, and even several switches are included. Basically, you do almost no "cutting and splicing" at all. That is the goal with a Classic Update kit. With the Painless or Francis kit, you will cut and splice 40-80 wires throughout the installation as you get no sockets, connectors, or alike. What you end up having to do is to cut and splice your 40+ year old connectors, pigtails, and lamp sockets (most of which are no good at this point anyway) onto your nice new harness which is very counter productive. Plus, you still get no switches with the other products.
I hope this helps you decide what is the best course of action for your car. If you need to speak with me about details, I will be happy to answer any particular questions you might have. I will be in the office today, and then not again until next Monday as I will be attending a show in Detroit this weekend.