Interestingly, with both memory kits set to the same frequency and timings, the Corsair One actually delivered a higher write speed, by about 2800MB/s. The Read speed was almost identical, but the writes in our Test System actually lagged behind slightly.
The Samsung PM9A1 used in the Corsair One i300 is a perfectly fine NVMe SSD. It may not be the absolute fastest we have ever speed, but with reads hitting 6.6GB/s and writes at 4.9GB/s, we can't really complain.
As for PCMark 10, the overall results here are very similar between all three systems. Our own test system did perform the best as expected, but the 165W or 180W power limits for the Corsair One didn't make a massive difference either way.