Ragnarok, Shiva, Odin, Moogle and Cerberus are all very close to each other when it comes to active characters. Shiva is the unofficial German server and Moogle is the unofficial French server, so you might encounter those languages more in the open world there.

https://ffxivcensus.com/

I wouldn't say the restrictions on character creation tell the whole story because they change almost daily on European servers. Only worlds marked as Congested are permanently locked.