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For real sense of UST wheels are also sealed from the wheel spokes. There are no spoke holes on the spoke bed. But it's more difficult to install and to seat on the rim properly. If spokes broke, it will be a headache to change the spokes.
3K weave is better because it is not as brittle as the UD. It displaces some of the pressure because it is not as hard as UD. However, this doesn't mean 3K is always better, because UD generally gives rim the most strength and allows the engineer more control in the layup patterns to optimize the rim structure.