I go with the "unusual" planes. Granted, often there is not that much documentation out there, or you are taking the documentation "piece meal" from MANY different sources.
I don't build my planes to show them, I build them to fly, but I do try to keep them as scale as possible.
One of my "projects" nearly drove me crazy (I think I am already there, but that is another story

). This project was an FW-56 (Stosser). Looking at actual photos of planes in the same flight squadren, one plane had steps built in/moulded into the strut fairing and the one next to it didn't, yet both planes were "supposedly" delivered to the squadren one day apart direct from the same factory. It got worse from there. But then I am not telling you folks anything you don't already know.
So far my "unusual" planes include a FW-56 (Stosser) [exhaust ports not installed at time of photo], a Bellanca Airbus (land version) and a Rearwin Speedster with a DOCUMENTED one of a kind FACTORY paint scheme as verified by Edwin Rearwin. The color and markings are correct for plane number 314. All of these planes are 40 size.