When comparing OviOS vs Unraid, the Slant community recommends Unraid for most people. In the question“What are the best operating systems for a NAS/File server?” Unraid is ranked 5th while OviOS is ranked 9th. The most important reason people chose Unraid is:
Easy to expand storage since it uses their own parity protection system. Mixing drive sizes is possible as long as parity drives have the highest or equal to highest capacity.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Easy setup, very fast, lightweight, once you install and configure you forget it's there
Pro Expandable
Easy to expand storage since it uses their own parity protection system. Mixing drive sizes is possible as long as parity drives have the highest or equal to highest capacity.
Pro Big app (docker) library
Docker images are specially set up for unraid and easy to install and manage.
Pro Stable
Cons
Con The lack of a UI can be a stopper for some users
The devs have announced from the first release they will not prioritize a UI.
Con Files randomly disappear
Con Corrupts files
Corrupts some files after a while.
Con Not free
Cost depends on how many drives you have (6, 12 or unlimited).
Con SSD cache needed
To achieve optimal speeds you need SSD cache.