Well you know opinions are like an A$$ holes, we all have one and here is mine. I've been around Turbo Buicks for over 28 years. I also buy them, make them road worthy and sell them as a hobby to support my cars and turbo addiction. You can look at it in two different ways. If the car is a keeper for life then it doesn't matter if it's a Turbo Regal or a GN. You just get or keep what you like and be done. As a business, I may sell 7 GNs before I can sell a turbo Regal. The main reason for that is; most the first time buyers want a GN from all the allure. The talk on the street it a National did this or National did that. They never say a T type or a Turbo regal. Once someone gets educated in the Turbo Buick realm then it will change otherwise every conversation starts with GN this and GN that.
I also get more money out a GN vs. T types. There are always exceptions to the rules. Turbo Regals are rare and unique and some people will pay good money for it. Once you get over the loosely used term of GN or National that people use for all the Turbo Buicks and come to a conclusion the fact that they are the same, it's much easier to make your decision. As for business from my experience GNs will sell faster and bring in more money from the public. If it's a collector then he may pay more for something unique if it's a must have.
Just my $.o2
Prasad