I bought a complete interior from Palco. I didn't like how the door panels fit at the bottom of the doors. I had power windows which resulted in a little more customization to look nice than I expected. Once I got them installed I was happy. It took a little time and patience. My car was an early model challenger convertible so that may have been the issue with the door panels.
My rear panels were very chalky and finding good white convertible panels for a 70 challenger was too much work for me. For me the real issue is how much of a perfectionist did i want to be. For just looking nice and ease of a quick swap I went with buying the complete interior. In the future I'll probably have the originals redone since I know the fit will be perfect. Both ways for me would be a little off from original. The two items that shaped my decission was the cost of going each direction and ease of completing the project once I started it.