When it comes to end game stuff server doesnt matter much. The duty/party/raid finder tool you use to put together groups works not only for the players on your server, but all the servers in the same data center. So if youre on Ragnarok and the more serious raiders are on Odin then the tools in place will allow you to group up with them. You can even join a Cross-server Linkshell to stay in contact with friends you make on other servers in your data center. Along with that, later this year a "world visit" system is going live, that will let you visit your friends servers in person without leaving yours. So all your home server is really determining is which FCs you can join, where your house is(if you have one), and where your retainers are selling things.