Alpine is the perfect little container OS I will say that.
It’s been a while since I have built a jail but I think Alpine would be a just a touch lighter from a disk point of view unless your running a thin jail then things get crazy light per jail but do come with disadvantages from what I remember.
I really with FreeBSD would get a port of Podman and I could just go back to my FreeBSD. My servers are rock solid since they where installed in the FreeBSD 10 days and just keep getting updated with no problems at all