ZFS is great and all, but I'd like to see more comparisons between different ZFS "distros"/forks/versions. Afaik (almost?) all current ones are based on OpenZFS upstream, but it is difficult to find what version of it various distros have used, and what sort of customizations have been added. The main ones I'd be interested in hearing more of are:

* FreeBSD/FreeNAS

* ZFS on Linux/Ubuntu ZFS

* Illumos derivates (SmartOS/OmniOS/OI)