Things to consider…
1 Which services do you want in addition to Time Machine backups?
> Basic file sharing is common to all, but streaming 4K video or hosting Windows virtual machines requires more power.
2 Can the NAS cope with increasing storage?
> These invariably grow with time, so you’re likely to want a system you can upgrade with larger hard drives.
3 Do you also need backup support?
> Families may be happy keeping copies of important documents on iCloud, but businesses need proper protection with remote backups stored in a cloud service.
4 Do you need to tune the configuration?
> Future macOS may require SMB connections, and adjustment to settings for optimum results.