Renewal has more players by three folds. However, the players of Classic Loki are generally doing what they can to try to boom the population more, so chances are, you would get help more easily than you would in Renewal Chaos. The events are far more rewarding in Classic Loki, too, because the staff wants the server to not die off. I could recommend specific guilds to you, but that's kind of like opening up a can of worms. Log in during WoE times, take note of which guilds are breaking Emps, and go talk to the ones that you like to be part of. Those are the guilds that will last for a long time as oppose to 'social' guilds, which don't last three months at best.