Please don't use distrowatch as a metric, it is utterly useless as a general usage metric due to it considering only within itself and not as a general statistic.

Well, if you have a better one, I'm all ears. I guess google trends could work, but that shows Kali Linux as absurdly popular compared to everything else.

The benchmark's accuracy is debatable, as it does not put all parties in even ground[1], nor it list in detail everything used for all systems beyond Dragonfly BSD.

[1] FreeBSD's nginx port does not have a functional 'reuseport' compilation flag, which greatly impacts its performance in the benchmark, whereas Linux and Dragonfly BSD do have it in a functional state.