Preferred World ?

[Enkidoh]

The Server Status page on the Lodestone lists what servers are currently classified as 'preferred', 'standard' and 'congested' and is regularly updated but the status can change rapidly so it's worth keeping up to date with. The most recent listing is found here: https://eu.finalfantasyxiv.com/lodestone/worldstatus/

It appears there are no servers in the EU server group currently classified as 'preferred' so you might have to look at a server on the JP or NA server groups instead which do have 'preferred' servers (if you were planning on being on a EU server): based on that information, specifically the servers Yojimbo and Zeromus in the JP Gaia Data Centre, and Exodus, Famfrit and Lamia in the NA Primal Data Centre are currently listed as 'Preferred' (paradoxially Yojimbo and Zeromus are also locked to new character creation due to too many characters logged in there, but the NA ones are open).

Bare in mind that change at a moment's notice without any updates on that site so it should be taken as a guide rather than a direct statement of the situation.