Depends on what you are after.

if you are after quietness and "power" then an old workstation is a great bet. They normally have space for at least 4 fullsized HDDs, the more modern ones have lots of PCI space for nvme-ssd cards (for space) and some have lots of lanes for speed

They also tend to come with SAS/whatever remote nvme is called/SATA expnasion options

The down side is they are not as space efficient, they also tend to have 60-120watt CPUs, so expensive to run