The original source features a frametime-based rating as well. Surprise, surprise, Windows 11 and Arch are both identical in terms of performance, while Pop!OS and Nobara are about 9% behind.
It's still open to interpretation what exactly they are measuring with their frame timings, e.g. is Windows consistently generating frames within 10.6ms but Nobora is up to 9% less performant then that, sometimes 11.6ms? Although this only seems to be for the 1% lows. I don't think it's a particularly insightful metric in this particular benchmark.