The two main benefits of USD forks are that they are stiffer in the tripletree to provide better control, and there is less unsprung weight as the smaller lower legs are lighter. Less unsprung weight means the suspension can be tuned better across the board, but helps the most for high-speed damping.
But whether those theoretical advantages become actual benefits on streetbikes, it's certainly up for debate. Some great handling bikes continue to use conventional forks happily, but for all-out sportbikes, it's a hard sell if they don't have the now ubiquitous USD design.
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