Dekaron Rising is the only private server that has working functions that are A9 and A9+, like the new skillbar, transup that isn't a costume, mavaric system, sleeps, aloken buffs, invsibility and totems, party pvp, new stat system, working bosses, etc.
Fortification rates are a bit challenging but not too bad, better than Global
.
Player count is also really high compared. There's an xtremetop list but I suggest you download the servers and see for yourself which is the best/most populated because many servers just autovote on xtremetop.
