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plat1098
I voted "Anniversary Update," not for speed but for reliability. The first Creators is a very close second. I found Fall CU to be with some unpleasant surprises in the form of unforeseen conflicts and hardware problems. Certain settings like keeping Fast Startup disabled were not respected after a couple of cumulative updates. Yeah, machines run "fast" on Fall CU but for me, it took more work and vigilance to get there than with previous OS versions.