Don't overlook the value of the car when it comes time to sell it. A '47 4 door built is worth less than half of the coupe in the same condition. I don't want to step on the toes of the 4 door owners but business is business and if you are torn between two cars it makes sense to go with the car that has the best market value down the road. That assumes, of cours, that it suits your needs and your personal likes. If you love a particular style that is what you should build.
Years ago, I was almost given a 57 Olds. I had a real tuff time staying interested in the car...It just wasn't me. After I got past the rust and started to see it come together I really got into it. The problem was, I sold the car for about half what a 2 door would have sold for plus it was a harder build.