At the time I finally get fed up with systemd there was less choice than now, I remember only Gentoo being real candidate for switching. Now we have devuan and void and gentoo, they are all very good systems. Since there was only Gentoo and I didn't want to compile stuff the only other real choice was FreeBSD.
I am surprisingly happy with FreeBSD, userland packages are very fresh, which I like being former Arch linux user. Kernel works at least on the level of linux kernel, maybe even better. Zfs is something that I didn't completely understand before I tried it out, even with all the theory I knew. Zfs is just mind blowing.
I very much love linux and it is not impossible to imagine switching back, at least for some of my machines.
It is mostly matter of sanity and nerves, I couldn't follow and understand all the systemd flaws while pretending everything is OK.