Hate to tell ya, but if you are a zone type PvP'er then you are on the most populated zone server and the one I have seen with the most arena duels happening, there are some things going on on some other servers for leagues but they have just started.
OLD SCHOOL PvP
Rad/Psi,Psi/Em,Fire/Em,Cld/Sonic,FF/Sonic,Grav/Ta,Storm/Psi,Sp/WP,Fire/Psi,Sonic/Pain
RIP:Southern Comfort PvP,PE PvP,INTEGRITY PvP,After School Special PvP Test SG's,TPvPL Season1+2 Runner ups
Just about all the PvPers I know moved to Freedom, so yeah. I don't think you're gonna find anything better.
The title says it all. I'm on Freedom right now because that's where I've been for a while, but I wouldn't mind relocating somewhere else if the PvP is better.
Anyone have any ideas of if one of the other servers (not test) is more PvP active?