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As a potential weapon material, pure uranium-233 is more similar to plutonium-239 than uranium-235 in terms of source (bred vs natural), half-life and critical mass (both 4–5 kg in beryllium-reflected sphere).
In 1994, the US government declassified a 1966 memo that states that uranium-233 has been shown to be highly satisfactory as a weapons material, though it is only superior to plutonium in rare circumstances. It was claimed that if the existing weapons were based on uranium-233 instead of plutonium-239, Livermore would not be interested in switching to plutonium.
The biggest attraction of U-233 in CoaDE, however, is simply that it's a lot cheaper than any other serious option while working just as well.