I have a question about the advantages/disadvantages of using Drobo or Synology with my Mac media server setup. I asked the question on SuperUser and someone closed it because it was too much of a "shopping question". Is this something that's ok to post in the Apple Stack Exchange?
Hardware recommendations are off topic here. It looks to me like your question is pretty much a hardware recommendation, so it would not be on topic here.
If you have a question about a specific piece of hardware (e.g., 'Can I use Plex to play files on my Drobo?'), you can ask it here.