I own a shop, and do restoration work. I have six vehicles right now that are in the different stages of being restored. I would think it depends on what the car is. A "65" Stang could be worth more done back to its orginal state, IF the car has qualities that are rare. The TV show leads us to believe they do a top quality job on these vehicles, and they may, but I would have to see one to base an opinion. Which would be worth more, a Chip Foose vehicle, or a Jack Rouse vehicle? Naturally one would think a Foose one would be, but what about when the vehicle has 20 more years on it. Foose likes to change things, and I'm not convinced that will add to the value of the vehicle down the road. Since the Stang is a uni-body vehicle, the Foose crew would do a good job, but I just wonder if they cut corners? Since they are always working against a deadline, anyone knows a big dab of body filler is faster than replacing the metal. We don't know what they do to them, but done ourself, we know for sure what it is. My vote would have to be with Chip, but for some reason I would always wonder if they really did the job as you see on TV, or did you see the magic of TV? Watching the Barrett Jackson show, I see some Foose vehicles, and they do seem to bring good money, but I haven't seen one they done bring the most money. For what ever reason, it always seems the one's that are as they came from the factory brings the most money. Ask yourself this; Would a numbers matching engine in the car, make it worth more than a crate engine installed by the Foose team? Stock, factory, as is, vehicles bring more at auction, and thats just a fact.
Glad to help out, Good Luck!!!