Hm, is ZFS already part of initrd and supported by grub for root fs? The last time I checked on ubuntu, this was not straight forward compared to btrfs. Also I need encryption/luks.
Discussion
I haven’t used it for root fs, I’ve only done it for large data drives. Not sure if it’s supported or not.
I’m mostly interested in the snapshots, compression and RAID like mirroring/parity. I’m not sure if it supports encryption.