Son of Beastie
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Note : UFS is very usefull on systems low on memory where ZFS is not an option.
I do not have anything against UFS as I stated here - it still has its uses - https://is.gd/bsdstg - but You have to be REALLY low on memory to not use ZFS
For example I have run 2 x 2TB ZFS mirror with 512 MB RAM along with running other services for years and it was stable as rock.
People forget that ZFS without RAM is just as fast as the storage devices below it - with RAM its just faster thanks to ZFS ARC cache.