The three big servers I believe are leviathan, behemoth, and Gilgamesh. So they may be best if you wish to do progression raiding, for this I would suggest looking into different fc's and applying to them. If not progression then most servers should be good. All servers have their own niche and fun groups. I am on ultros and my fc run all kinds of content only a hand full are doing progression raiding, but we have a good community. If that interests you let me know - Merida Quigg