Well, where abouts do you live? If you live in NA, either Aether or Primal will not offer much of a ping change, as I believe both data centers are located in the same place on the west coast. If you live in the EU, an EU server would be better for you ping-wise as opposed to an NA server. If you live in Japan or Oceania, Tonberry is the preferred server for the latter, and it’s also the only JP data center world that has a large English speaking community.

You also have the option of paying for a VPN if you would rather not relocate to another server, but want to decrease your latency/improve your connection.