Truth is the important thing in life...along with mercy, but now I'm getting too philosophical. Truth about everything. I think the truth about that whole era in our history is not well illuminated or understood. I think Jeff Davis gets a bad rap in the mainline textbooks. I think Lincoln gets a free pass (though that seems to be changing), and his sins are covered up and excused. That does not mean I think Lincoln is the worst figure in history, or that Jeff Davis is right up there with the Apostle Paul.
PS: As to whether the DofI or the Constition better represents American principles, I don't see a need to choose between those, because they are consistent with each other. The important thing about the Constitution is that it is supposed to be the Law of the Land; the law concerning how laws are to be made; the covenant made between the states in order to belong to each other as a nation. This means it's an extremely important document, even if flawed, and should be taken seriously and defneded.