I'll support this
If your goal is to set up a media server, a few services, and a storage for non-essential files*, it is hard to beat unraid. Free is obviously better, but it has the best support for mismatched drive sizes and, arguably, the highest percentage of "usable" space. Try to wait for a sale (there are quite a few per year) but it is also a lifetime license so...
There are performance implications and I never trust any solution that can only survive two drive failures. Especially when recovery involves heavy reads and writes. Because drives tend to fail in groups and stressing a drive on its last legs is never a good idea.
*: Which, to be fair, should be how any locally stored file is treated. Unless you have it backed up off site in at least one location (preferably two), it is not backed up. Which is why my media collection is YOLO but my (encrypted) documents and personal photos go into a cloud storage bucket on a weekly basis.