Looking to change OS because the one im using its not stable

I currently use Unraid because I love being able to have diferent capacity disk and expand the array when I can unlike RAID and also you lose 1 drive you lose 1 drive data not all data like RAID, also you can get any disk and read it outside unraid like a normal disk, but recently I discovered this now can be done on linux followin this guide? Will it be like unraid?

I have been having some bugs with unraid for example each time the array start the webUI crash and I have to ssh and restart it, I just want a stable OS the has something like the arrays in unraid.

What OS do you use and why?

I only Ubuntu server and unraid.

I mainly use docker and only 1vm for home assistant so Im not interested in proxmox.

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