Just learned about it recently. It has received a lot of praise as a rolling release distro. Also it uses runit instead of systemd.
It has been praised also for being more stable and better designed than Arch.
And I wonder how it compares to OpenSUSE Tumbleweed,


Not really from the ground up. Their XFCE variant is amazingly convenient nowadays.
That’s true. Maybe I’m just projecting, because I think Void is best pieced together from a bare bones install.
It’s a great distro to build from ground up though, really fun.