I cant argue about price vs performance on pc vs NAS. PC wins hands down.
But the advantages to NAS are its pretty much plug and play. Only decision you need to make is what size hard drive. They have a slick gui, with a walled garden app store. But you pay a lot more for less performance. They are less flexibleand more restrictive in what you can do. This makes them more secure because theres not as many settings or stuff for consumer to **** up.
Diy. Less money but more work. Picking hardware, setting up truenas, raid, dealing with linux. If it breaks you dont have dedicated tech support. But far more flexible, expandable.
There are benefits to both. But any modern 4 core NAS will be able to keep up with comskip and transcoding for a household.
As far as NAS recommendations. Buy the most expensive synology in whatever your budget is.
Festures I like.
NVME slot for cache drive
4 cores +
4 bay plus. Then setup Raid 5 or otner preference.
Synology is kost popular, so theres more native support.