The two works are really somewhat complementary. One (March) is descriptive. The other(s) (Friedman) are expository.
Accuracy is not really an issue, especially for ships built prior to the end of World War II, where all of the relevant material has been declassified for many years now.
March is much better regarding overall technical details, is better organized, and includes a large number of drawings showing details of internal arrangements etc. which are very rarely seen in published works. Friedman's books describe the politics and tradeoffs behind a specific design in more detail.
If I had to pick one over the other, I'd take March as it's much easier to find specific details there. If you want technical description, use March. If you want evolutionary analysis, use Friedman.
Bill Jurens
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